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TIL “morning wood” occurs during REM sleep when certain neurotransmitters slow down which normally control blood flow. Morning wood also helps with bladder control at night.

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kOdNg TIL Willem Kolff created the first dialysis machine in the Netherlands during WWII. Lacking materials, he used sausage casings, tin cans, a washing machine, and salt water. He also saved more than 800 people from the Nazis by hiding them in his hospital. And he later invented the artificial heart.
e0DRb TIL that fallout from nuclear testing has made it possible to carbon date people.
YK8v TIL that James Blunt sings the first line “My life is brilliant” of You’re Beautiful twice in the beginning of the song because he mistimed it. It was left in the final recordings.
kO8j5 TIL that in the theatrical release of Bruce Almighty, God pages Bruce using a real phone number. The owners of the number (which included a church in North Carolina) got hundreds of phone calls from people wanting to talk to God. The TV/video versions were edited to show the fictional 555 exchange.
j61kv TIL In certain situations (the conditions of which are still up for debate) warm water has been observed to freeze faster than cold water, as the result of what is known as the Mpemba effect. These observations go far back enough to be traced to claims by ancient philosopher Aristotle.