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TIL spiders lack leg muscles and instead extend their legs through a hydraulic system powered by their blood pressure. Upon death, the legs curl up due to the loss of blood pressure.

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P40O TIL that in 2002, Dave Grohl became the first person to hold the number one spot on the modern rock charts as a member of three different groups
ZKgG TIL: MRSA (the near incurable flesh eating staph infection) has gone airborne.
DQ7me TIL after people are diagnosed with heart disease, less than 60 percent of all patients take a statin.
ZKPp TIL the British used Pundits to explore Tibet in the 1800s. Disguised as religious pilgrims, these Indian men were trained to walk precisely 2,000 steps per mile, and mapped much of the area for the British while skirting the bans placed on westerners.
6EkYY TIL About a man called "Wanksy", who has been painting penises around potholes in Manchester so that the city will fix them.