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THE SCIENCE & TECH DEPARTMENT

Science & Tech.
The longer view.

Research, technology and claims about their capabilities.

Browse departments Science & Tech · 187 stories

“Read as of” includes versions published by the end of that day in America/Chicago. Later revisions stay outside that view.

Science & Tech

The latest in the library

39 stories · 12 retained editions

Archived reporting carries its original evidence limits. A recent publication date does not establish that conditions remain the same.

New heat-health indicators put pregnancy and childhood outcomes beside temperature

Four UN agencies launched priority indicators on October 21 to track heat exposure alongside pregnancy and child-health outcomes. The framework may help officials spot warning signals; it does not show that any particular birth outcome was caused by heat or that protection has already improved. Families can use WHO’s existing practical heat guidance while following local advice.

Global WHO/WMO/UNICEF/UNFPA October 21, 2026 announcement. Framework monitoring and older July 31 general heat guidance; no individual diagnosis, local alert, attribution of a birth outcome or measured framework benefit.

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  1. Oct 22, 2026, 7:00 AM · Revision 1New heat-health indicators put pregnancy and childhood outcomes beside temperature

WHO and ILO add a way to check whether TB support actually reaches families

The October 21 framework asks countries to measure whether people with TB receive timely, adequate health and social support. It creates no automatic benefit. WHO cites catastrophic costs for 47% of treated people and households in countries with national cost surveys; that figure is not a result for every household worldwide.

Global WHO October 21, 2026 announcement of a WHO–ILO social-protection monitoring framework. Older 2023 commitment and 2027 target are context. No new national entitlement, eligibility finding, payment or measured health outcome.

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  1. Oct 22, 2026, 7:00 AM · Revision 1WHO and ILO add a way to check whether TB support actually reaches families

FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

FDA’s October 20 approval covers Hibsago with existing antivirals for a restricted adult hepatitis B group without cirrhosis. Serious liver and platelet risks require monitoring. Approval does not mean that everyone with hepatitis B qualifies or can stop existing medicine.

U.S. FDA October 20, 2026 approval announcement for Hibsago in certain adults with chronic hepatitis B. Regulatory news only; no individual eligibility, prescribing or medicine-stopping instruction, trial reanalysis, availability or price finding.

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  1. Oct 21, 2026, 3:43 PM · Revision 5FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

Wisconsin opens PFAS testing help; private-well owners have two routes to check

Wisconsin has launched community PFAS sampling grants and separate home-testing assistance, WPR reports. Eligible private-well owners unable to test through community grants can get a no-cost kit. Assistance is conditional; it is not proof that a well is safe or that an applicant qualifies.

Wisconsin PFAS sampling programs, launch reported October 21, 2026 following the October 20 announcement. Attributed original WPR reporting, not an application, individual eligibility determination, water-quality result or guarantee of remediation.

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  1. Oct 21, 2026, 3:43 PM · Revision 5Wisconsin opens PFAS testing help; private-well owners have two routes to check

FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

FDA’s October 20 approval covers Hibsago with existing antivirals for a restricted adult hepatitis B group without cirrhosis. Serious liver and platelet risks require monitoring. Approval does not mean that everyone with hepatitis B qualifies or can stop existing medicine.

U.S. FDA October 20, 2026 approval announcement for Hibsago in certain adults with chronic hepatitis B. Regulatory news only; no individual eligibility, prescribing or medicine-stopping instruction, trial reanalysis, availability or price finding.

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  1. Oct 21, 2026, 1:32 PM · Revision 4FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

Wisconsin opens PFAS testing help; private-well owners have two routes to check

Wisconsin has launched community PFAS sampling grants and separate home-testing assistance, WPR reports. Eligible private-well owners unable to test through community grants can get a no-cost kit. Assistance is conditional; it is not proof that a well is safe or that an applicant qualifies.

Wisconsin PFAS sampling programs, launch reported October 21, 2026 following the October 20 announcement. Attributed original WPR reporting, not an application, individual eligibility determination, water-quality result or guarantee of remediation.

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  1. Oct 21, 2026, 1:32 PM · Revision 4Wisconsin opens PFAS testing help; private-well owners have two routes to check

First generic Climara Pro patch approved; price and availability still need checking

FDA announced the first generic of the once-weekly combined Climara Pro patch, approved October 19. It is for specified uses in women with an intact uterus and carries important contraindications. Regulatory equivalence does not establish current stock, insurance coverage or a lower personal bill.

U.S. FDA October 20, 2026 announcement of an October 19 approval of the first generic Climara Pro combined estradiol–levonorgestrel patch. No individual medical advice, full label, price comparison, launch confirmation or recommendation to switch.

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  1. Oct 21, 2026, 9:50 AM · Revision 3First generic Climara Pro patch approved; price and availability still need checking

FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

FDA’s October 20 approval covers Hibsago with existing antivirals for a restricted adult hepatitis B group without cirrhosis. Serious liver and platelet risks require monitoring. Approval does not mean that everyone with hepatitis B qualifies or can stop existing medicine.

U.S. FDA October 20, 2026 approval announcement for Hibsago in certain adults with chronic hepatitis B. Regulatory news only; no individual eligibility, prescribing or medicine-stopping instruction, trial reanalysis, availability or price finding.

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  1. Oct 21, 2026, 9:50 AM · Revision 3FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

First generic Climara Pro patch approved; price and availability still need checking

FDA announced the first generic of the once-weekly combined Climara Pro patch, approved October 19. It is for specified uses in women with an intact uterus and carries important contraindications. Regulatory equivalence does not establish current stock, insurance coverage or a lower personal bill.

U.S. FDA October 20, 2026 announcement of an October 19 approval of the first generic Climara Pro combined estradiol–levonorgestrel patch. No individual medical advice, full label, price comparison, launch confirmation or recommendation to switch.

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  1. Oct 21, 2026, 8:39 AM · Revision 2First generic Climara Pro patch approved; price and availability still need checking

FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

FDA’s October 20 approval covers Hibsago with existing antivirals for a restricted adult hepatitis B group without cirrhosis. Serious liver and platelet risks require monitoring. Approval does not mean that everyone with hepatitis B qualifies or can stop existing medicine.

U.S. FDA October 20, 2026 approval announcement for Hibsago in certain adults with chronic hepatitis B. Regulatory news only; no individual eligibility, prescribing or medicine-stopping instruction, trial reanalysis, availability or price finding.

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  1. Oct 21, 2026, 8:39 AM · Revision 2FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

NASA’s rover update separates hardware tests from future Moon missions

NASA’s October 20 update says VIPER is built and in final testing, while crew-capable rover mockups are being evaluated. The 2027 mission and hardware targets and 2028 delivery aim remain future plans. A mockup, test and landing are different milestones.

NASA’s October 20, 2026 Moon Base rover progress update. Agency-reported build/testing status and stated plans; no independently verified landing, future launch, final performance or completed design review inferred.

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  1. Oct 21, 2026, 8:39 AM · Revision 2NASA’s rover update separates hardware tests from future Moon missions

First generic Climara Pro patch approved; price and availability still need checking

FDA announced the first generic of the once-weekly combined Climara Pro patch, approved October 19. It is for specified uses in women with an intact uterus and carries important contraindications. Regulatory equivalence does not establish current stock, insurance coverage or a lower personal bill.

U.S. FDA October 20, 2026 announcement of an October 19 approval of the first generic Climara Pro combined estradiol–levonorgestrel patch. No individual medical advice, full label, price comparison, launch confirmation or recommendation to switch.

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Time & versions · 1

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  1. Oct 21, 2026, 7:30 AM · Revision 1First generic Climara Pro patch approved; price and availability still need checking

FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

FDA’s October 20 approval covers Hibsago with existing antivirals for a restricted adult hepatitis B group without cirrhosis. Serious liver and platelet risks require monitoring. Approval does not mean that everyone with hepatitis B qualifies or can stop existing medicine.

U.S. FDA October 20, 2026 approval announcement for Hibsago in certain adults with chronic hepatitis B. Regulatory news only; no individual eligibility, prescribing or medicine-stopping instruction, trial reanalysis, availability or price finding.

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Time & versions · 1

Development date: . First retained publication: . Times are Central.

  1. Oct 21, 2026, 7:30 AM · Revision 1FDA approves a hepatitis B option with narrow eligibility and serious monitoring risks

NASA’s rover update separates hardware tests from future Moon missions

NASA’s October 20 update says VIPER is built and in final testing, while crew-capable rover mockups are being evaluated. The 2027 mission and hardware targets and 2028 delivery aim remain future plans. A mockup, test and landing are different milestones.

NASA’s October 20, 2026 Moon Base rover progress update. Agency-reported build/testing status and stated plans; no independently verified landing, future launch, final performance or completed design review inferred.

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  1. Oct 21, 2026, 7:30 AM · Revision 1NASA’s rover update separates hardware tests from future Moon missions

FDA clarifies when a prescription-drug app belongs on the medicine’s label

FDA’s October 20 announcement distinguishes apps connected to medical devices from standalone reminders and trackers when describing prescribing information. It announces labeling recommendations, while leaving a particular app’s approval, usefulness and suitability to be checked separately.

United States. FDA October 20, 2026 announcement about software distributed by drug companies alongside prescription medicines. A report on the agency’s announced recommendations, not an app approval, patient-specific treatment instruction, legal compliance opinion or evidence of improved health outcomes.

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  1. Oct 20, 2026, 2:22 PM · Revision 3FDA clarifies when a prescription-drug app belongs on the medicine’s label

FDA opens an immunotherapy option for a narrow rectal-cancer group

FDA’s October 19 accelerated approval offers Jemperli alone to a specified group of previously untreated stage II/III rectal-cancer patients with dMMR or MSI-H tumors. Interim results may permit avoiding other treatments, but durability, surveillance and serious immune-related harms remain central.

United States FDA accelerated approval announced October 19, 2026: adults with previously untreated stage II/III locally advanced rectal cancer that is dMMR or MSI-H on an FDA-authorized test. Institutional decision account and interim studies, not personal medical advice or universal cure.

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  1. Oct 20, 2026, 2:22 PM · Revision 3FDA opens an immunotherapy option for a narrow rectal-cancer group

FDA clarifies when a prescription-drug app belongs on the medicine’s label

FDA’s October 20 announcement distinguishes apps connected to medical devices from standalone reminders and trackers when describing prescribing information. It announces labeling recommendations, while leaving a particular app’s approval, usefulness and suitability to be checked separately.

United States. FDA October 20, 2026 announcement about software distributed by drug companies alongside prescription medicines. A report on the agency’s announced recommendations, not an app approval, patient-specific treatment instruction, legal compliance opinion or evidence of improved health outcomes.

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  1. Oct 20, 2026, 10:21 AM · Revision 2FDA clarifies when a prescription-drug app belongs on the medicine’s label

FDA opens an immunotherapy option for a narrow rectal-cancer group

FDA’s October 19 accelerated approval offers Jemperli alone to a specified group of previously untreated stage II/III rectal-cancer patients with dMMR or MSI-H tumors. Interim results may permit avoiding other treatments, but durability, surveillance and serious immune-related harms remain central.

United States FDA accelerated approval announced October 19, 2026: adults with previously untreated stage II/III locally advanced rectal cancer that is dMMR or MSI-H on an FDA-authorized test. Institutional decision account and interim studies, not personal medical advice or universal cure.

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  1. Oct 20, 2026, 10:21 AM · Revision 2FDA opens an immunotherapy option for a narrow rectal-cancer group

FDA opens an immunotherapy option for a narrow rectal-cancer group

FDA’s October 19 accelerated approval offers Jemperli alone to a specified group of previously untreated stage II/III rectal-cancer patients with dMMR or MSI-H tumors. Interim results may permit avoiding other treatments, but durability, surveillance and serious immune-related harms remain central.

United States FDA accelerated approval announced October 19, 2026: adults with previously untreated stage II/III locally advanced rectal cancer that is dMMR or MSI-H on an FDA-authorized test. Institutional decision account and interim studies, not personal medical advice or universal cure.

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  1. Oct 20, 2026, 7:37 AM · Revision 1FDA opens an immunotherapy option for a narrow rectal-cancer group

Kīlauea’s fountains pause; USGS cannot yet time the next episode

USGS’s October 18 update says Kīlauea is paused after episode 55 ended at 9:03 a.m. HST on October 17. Summit reinflation continues, but HVO says it needs more data to forecast episode 56. Gas and unstable terrain remain hazards during a pause.

Kīlauea summit, Hawaiʻi Island. USGS HVO update issued October 18 at 10:30 a.m. HST / 20:30 UTC; episode 55 observations from October 17. Not a current household exposure reading, visitor-access clearance, flight briefing or forecast countdown.

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  1. Oct 19, 2026, 8:16 AM · Revision 2Kīlauea’s fountains pause; USGS cannot yet time the next episode

Kīlauea’s fountains pause; USGS cannot yet time the next episode

USGS’s October 18 update says Kīlauea is paused after episode 55 ended at 9:03 a.m. HST on October 17. Summit reinflation continues, but HVO says it needs more data to forecast episode 56. Gas and unstable terrain remain hazards during a pause.

Kīlauea summit, Hawaiʻi Island. USGS HVO update issued October 18 at 10:30 a.m. HST / 20:30 UTC; episode 55 observations from October 17. Not a current household exposure reading, visitor-access clearance, flight briefing or forecast countdown.

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  1. Oct 19, 2026, 7:00 AM · Revision 1Kīlauea’s fountains pause; USGS cannot yet time the next episode

Check the code: Family Farmstead recalls raw mild cheddar

Family Farmstead Dairy’s October 15 notice recalls raw mild cheddar marked 7/22/27 because of potential E. coli contamination. Do not eat a matching package: discard it or return it for a refund. The named distribution states may not cover every downstream sale.

United States; Family Farmstead Dairy issuer recall notice posted by FDA October 15, 2026. Raw mild cheddar marked 7/22/27; named distribution states may not cover downstream sales. No illness diagnosis or independent lab verification by Codex.

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  1. Oct 17, 2026, 4:20 PM · Revision 4Check the code: Family Farmstead recalls raw mild cheddar

FDA’s new Starfish salmon notice names a different product code

Check Starfish Seafood’s 227 g/8 oz premium sliced salmon for lot D080-148, UPC 4751048940099 and best-before date 27.11.2027. FDA’s October 16 posting tells purchasers not to eat it and to return it for a refund. The older seafood-trio warning has different identifiers.

United States; issuer notices on FDA’s website. New salmon notice posted October 16, 2026, with company announcement date October 9; comparison notice posted October 9 is background. Do not infer cancellation, expansion or replacement of either recall.

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  1. Oct 17, 2026, 4:20 PM · Revision 4FDA’s new Starfish salmon notice names a different product code

Check the code: Family Farmstead recalls raw mild cheddar

Family Farmstead Dairy’s October 15 notice recalls raw mild cheddar marked 7/22/27 because of potential E. coli contamination. Do not eat a matching package: discard it or return it for a refund. The named distribution states may not cover every downstream sale.

United States; Family Farmstead Dairy issuer recall notice posted by FDA October 15, 2026. Raw mild cheddar marked 7/22/27; named distribution states may not cover downstream sales. No illness diagnosis or independent lab verification by Codex.

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  1. Oct 17, 2026, 1:21 PM · Revision 3Check the code: Family Farmstead recalls raw mild cheddar

FDA’s new Starfish salmon notice names a different product code

Check Starfish Seafood’s 227 g/8 oz premium sliced salmon for lot D080-148, UPC 4751048940099 and best-before date 27.11.2027. FDA’s October 16 posting tells purchasers not to eat it and to return it for a refund. The older seafood-trio warning has different identifiers.

United States; issuer notices on FDA’s website. New salmon notice posted October 16, 2026, with company announcement date October 9; comparison notice posted October 9 is background. Do not infer cancellation, expansion or replacement of either recall.

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  1. Oct 17, 2026, 1:21 PM · Revision 3FDA’s new Starfish salmon notice names a different product code

Check the code: Family Farmstead recalls raw mild cheddar

Family Farmstead Dairy’s October 15 notice recalls raw mild cheddar marked 7/22/27 because of potential E. coli contamination. Do not eat a matching package: discard it or return it for a refund. The named distribution states may not cover every downstream sale.

United States; Family Farmstead Dairy issuer recall notice posted by FDA October 15, 2026. Raw mild cheddar marked 7/22/27; named distribution states may not cover downstream sales. No illness diagnosis or independent lab verification by Codex.

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  1. Oct 17, 2026, 9:38 AM · Revision 2Check the code: Family Farmstead recalls raw mild cheddar

FDA’s new Starfish salmon notice names a different product code

Check Starfish Seafood’s 227 g/8 oz premium sliced salmon for lot D080-148, UPC 4751048940099 and best-before date 27.11.2027. FDA’s October 16 posting tells purchasers not to eat it and to return it for a refund. The older seafood-trio warning has different identifiers.

United States; issuer notices on FDA’s website. New salmon notice posted October 16, 2026, with company announcement date October 9; comparison notice posted October 9 is background. Do not infer cancellation, expansion or replacement of either recall.

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  1. Oct 17, 2026, 9:38 AM · Revision 2FDA’s new Starfish salmon notice names a different product code

Check the code: Family Farmstead recalls raw mild cheddar

Family Farmstead Dairy’s October 15 notice recalls raw mild cheddar marked 7/22/27 because of potential E. coli contamination. Do not eat a matching package: discard it or return it for a refund. The named distribution states may not cover every downstream sale.

United States; Family Farmstead Dairy issuer recall notice posted by FDA October 15, 2026. Raw mild cheddar marked 7/22/27; named distribution states may not cover downstream sales. No illness diagnosis or independent lab verification by Codex.

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  1. Oct 17, 2026, 7:00 AM · Revision 1Check the code: Family Farmstead recalls raw mild cheddar

FDA’s new Starfish salmon notice names a different product code

Check Starfish Seafood’s 227 g/8 oz premium sliced salmon for lot D080-148, UPC 4751048940099 and best-before date 27.11.2027. FDA’s October 16 posting tells purchasers not to eat it and to return it for a refund. The older seafood-trio warning has different identifiers.

United States; issuer notices on FDA’s website. New salmon notice posted October 16, 2026, with company announcement date October 9; comparison notice posted October 9 is background. Do not infer cancellation, expansion or replacement of either recall.

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  1. Oct 17, 2026, 7:00 AM · Revision 1FDA’s new Starfish salmon notice names a different product code

NASA counts fewer heat-shield char-loss spots after Artemis II

NASA’s October 15 assessment reports nine char-loss spots on Artemis II’s heat shield, versus 103 on Artemis I. The agency credits a changed reentry path. These inspection counts do not measure how much safer a future flight will be.

NASA’s October 15, 2026 post-flight assessment of Orion heat shields after Artemis I and II. Counts are char-loss spots of varying sizes on each heat-shield dish, not damaged area, damaged blocks, failure probability or an independent safety certification. The mission return occurred in April; publication of additional analysis is the fresh development.

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  1. Oct 16, 2026, 3:44 PM · Revision 4NASA counts fewer heat-shield char-loss spots after Artemis II

NASA maps the Panhandle’s returning lights after Hurricane Isaias

NASA’s new October 16 analysis shows lights returning around Pensacola and toward Destin after Isaias. By October 14, regional lighting resembled pre-storm conditions. That dated observation cannot establish whether an individual home has power or is safe to enter.

Pensacola and the U.S. Route 98 corridor toward Destin, Florida; NASA analysis published October 16, 2026, describing August and October 11–14 observations. Nighttime light is not a count of powered customers or a live restoration, reentry or building-safety notice.

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  1. Oct 16, 2026, 3:44 PM · Revision 4NASA maps the Panhandle’s returning lights after Hurricane Isaias

NASA’s new El Niño maps track a warmer, higher—and bluer—Pacific

NASA’s October 15 account combines sea-height, temperature and ocean-color views of the 2026 El Niño. The measurements tell different parts of the ocean story. They do not give a local forecast of this winter’s snow, storms or bills.

NASA’s October 15 account of 2025–2026 equatorial Pacific satellite and ocean observations. Sea height, temperature and ocean color are different measurements. This article does not issue a local winter, snow, flood or household-energy forecast.

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  1. Oct 16, 2026, 12:49 PM · Revision 3NASA’s new El Niño maps track a warmer, higher—and bluer—Pacific

NASA maps the Panhandle’s returning lights after Hurricane Isaias

NASA’s new October 16 analysis shows lights returning around Pensacola and toward Destin after Isaias. By October 14, regional lighting resembled pre-storm conditions. That dated observation cannot establish whether an individual home has power or is safe to enter.

Pensacola and the U.S. Route 98 corridor toward Destin, Florida; NASA analysis published October 16, 2026, describing August and October 11–14 observations. Nighttime light is not a count of powered customers or a live restoration, reentry or building-safety notice.

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  1. Oct 16, 2026, 12:49 PM · Revision 3NASA maps the Panhandle’s returning lights after Hurricane Isaias

NASA’s new El Niño maps track a warmer, higher—and bluer—Pacific

NASA’s October 15 account combines sea-height, temperature and ocean-color views of the 2026 El Niño. The measurements tell different parts of the ocean story. They do not give a local forecast of this winter’s snow, storms or bills.

NASA’s October 15 account of 2025–2026 equatorial Pacific satellite and ocean observations. Sea height, temperature and ocean color are different measurements. This article does not issue a local winter, snow, flood or household-energy forecast.

Read the story
Time & versions · 1

Development date: . First retained publication: . Times are Central.

  1. Oct 16, 2026, 10:00 AM · Revision 2NASA’s new El Niño maps track a warmer, higher—and bluer—Pacific

NASA’s new El Niño maps track a warmer, higher—and bluer—Pacific

NASA’s October 15 account combines sea-height, temperature and ocean-color views of the 2026 El Niño. The measurements tell different parts of the ocean story. They do not give a local forecast of this winter’s snow, storms or bills.

NASA’s October 15 account of 2025–2026 equatorial Pacific satellite and ocean observations. Sea height, temperature and ocean color are different measurements. This article does not issue a local winter, snow, flood or household-energy forecast.

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  1. Oct 16, 2026, 7:00 AM · Revision 1NASA’s new El Niño maps track a warmer, higher—and bluer—Pacific

NASA’s battery survived colder conditions than it could work in

NASA says small SPEARS battery prototypes worked at −80°C with reduced performance and survived exposure down to −170°C. They could not operate at −170°C: heaters would first have to warm them. The October 14 account describes research, not a flight-ready lunar power system.

NASA’s October 14 SPEARS research account of small prototype cells in thermal-vacuum tests. Actual test dates, sample sizes and cycle statistics are not given. Survival after exposure, operation at temperature and future flight qualification are different claims.

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  1. Oct 15, 2026, 9:49 AM · Revision 1NASA’s battery survived colder conditions than it could work in

Christina Koch is leaving flight duty for NASA engineering leadership

NASA announced October 13 that astronaut Christina Koch will become acting deputy chief engineer on November 1. The move brings flight experience into agency-wide technical oversight and transitions her to management astronaut status, ending eligibility for future spaceflight assignments.

NASA’s October 13 announcement of a leadership transition beginning November 1. The appointment and stated responsibilities are agency announcements, not independently measured improvements in safety or mission performance.

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  1. Oct 14, 2026, 11:32 AM · Revision 4Christina Koch is leaving flight duty for NASA engineering leadership

Christina Koch is leaving flight duty for NASA engineering leadership

NASA announced October 13 that astronaut Christina Koch will become acting deputy chief engineer on November 1. The move brings flight experience into agency-wide technical oversight and transitions her to management astronaut status, ending eligibility for future spaceflight assignments.

NASA’s October 13 announcement of a leadership transition beginning November 1. The appointment and stated responsibilities are agency announcements, not independently measured improvements in safety or mission performance.

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  1. Oct 14, 2026, 11:25 AM · Revision 3Christina Koch is leaving flight duty for NASA engineering leadership

Christina Koch is leaving flight duty for NASA engineering leadership

NASA announced October 13 that astronaut Christina Koch will become acting deputy chief engineer on November 1. The move brings flight experience into agency-wide technical oversight and transitions her to management astronaut status, ending eligibility for future spaceflight assignments.

NASA’s October 13 announcement of a leadership transition beginning November 1. The appointment and stated responsibilities are agency announcements, not independently measured improvements in safety or mission performance.

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  1. Oct 14, 2026, 7:59 AM · Revision 2Christina Koch is leaving flight duty for NASA engineering leadership