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TIL Compulsive gambling affects about 5 million U.S. residents.

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via reddit.com

6EavQ TIL that cats knead different objects and for different reasons. When it kneads its owner, it's usually to return affection. Female cats might knead to signal that they're ready for mating. Cats in general might also knead to stretch their muscles or even mark their territories.
8eBAG TIL that the F-22 Raptor took so long to develop, that the CPUs for its in flight computer had become obsolete by three generations by the time the first production jet flew in 1997, resulting in even further delays as a new flight computer had to be designed based on the PowerPC processor.
a8EYb TIL that a genetic mutation made the Arabian Peninsula population lactose tolerent and able to survive on camel milk and live in arid climate. This was a factor in early Muslims' victories over the Persian and Roman empires as Arab fighters could launch raids before retreating deep into the desert
wnN7 TIL George Clooney once said that he’d trade lives with Richard Branson if he could. Branson’s wife instantly responded: “Done!”
Bra1e TIL of Qian Xuesen, a Chinese aerospace engineer who was a founding member of JPL. When he was stripped of his security clearances during the Red Scare despite protests by his colleagues, he moved back to China where he became well known as the "Father of Chinese Rocketry"