WNISR 2026 says global solar power generation exceeded nuclear output in 2025, as renewable capacity expanded much faster than nuclear.
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BIPM Decides To Stop Adding Leap Seconds To UTC
A 2026 CGPM resolution sets continuous UTC from May 20, 2027, ending leap-second adjustments and allowing UT1 to differ by up to one hour.
AI Safety Is Not A Corporate Plot
An Astral Codex Ten essay argues that concern about extreme AI risks spans independent researchers and predates today’s AI companies.
Open Thread 455
Astral Codex Ten’s Open Thread 455 shares community updates, a donation match for Legal Impact for Chickens and an AFFINE research residency.
Antarctic Sea Ice Grows To Its 2026 Maximum
NASA and NSIDC estimate Antarctic sea ice peaked at 17.59 million square kilometers on Sept. 14, the third-lowest maximum in the satellite record.
Interactive decision theater: A Look Inside “PITWALL — Win or Lose It in One Lap” (FABLE/175)
“PITWALL — Win or Lose It in One Lap” — see it…
NASA Seeks US Industry Plans For Commercial Space Stations
NASA has issued a final solicitation for commercial low Earth orbit destinations, with proposals due Dec. 8 and awards expected in spring 2027.
An Open Letter To Steven Pinker On AI
Scott Alexander responds to Steven Pinker’s open letter, disputing his arguments about AI intelligence and the risks of future systems.
‘Jonathan’ Is The Oldest Land Animal On Earth
Researchers sequenced Jonathan’s genome, examining traits linked to aging in the roughly 194-year-old Aldabra giant tortoise.
Opus 5.5 Agents Discover Two Room-temperature Magnetic Semiconductor Candidates
Vals AI reports two calculated candidates for room-temperature magnetic semiconductors, including a newly designed compound and one made in 1999.