New Research on Muscle Loss Suggests Humans Will Really Suffer on Mars. Researchers exposed mice aboard the ISS to various levels of artificial gravity, they found that 0.67 g (67% of Earth’s gravity) is a key threshold—any gravity level lower than this caused their muscles to deteriorate.

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Unlogged tables go the other direction. Instead of changing how we get data out of Postgres, they change how data goes in. Unlogged tables skip the WAL entirely — no write-ahead logging, no fsync, no crash recovery. Inserts are faster because Postgres isn't making durability guarantees about video frames.

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刘洋,资深编辑,曾在多家知名媒体任职,擅长将复杂话题通俗化表达。