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Lunar quarantine

Space quarantine

When the Apollo 11 astronauts arrived back on Earth, no-one knew whether they were contaminated with secret space viruses or not – so the astronauts stayed in an Airstream trailer under quarantine for three weeks.

Gut brains

Brain

The human gastrointestinal tract has half a billion neurons embedded in its lining. Often described as the “second brain,” it can act and react autonomously, and even has its own supply of serotonin and dopamine. 

Kidney stone paradox

Simpson's paradox

Statistics are tricky. Consider this: of two treatments for kidney stones, Treatment A is better on average for large stones and small stones. But consider all stones together and Treatment B is better. This is Simpson’s paradox.