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TIL two billion people in the world suffer from iron deficiency (anemia) and that this can be solved by putting a little iron fish into one’s cooking pot.

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l5p1 TIL that William Whipple freed his slaves when he signed the Declaration of Independance, because he believed that he could not fight for freedom and own slaves
4kVLa TIL: Every Java class binary starts with the 8-digit hexadecimal number 0xCAFE_BABE. If you own an Android phone, this "magic number" is likely compiled into thousands of individual files on it.
b9n6Q TIL that Return of the Jedi was originally titled Revenge of the Jedi. Only after printing thousands of posters did George Lucas decide to change the name, making the posters worthless for advertising. Lucas then sold them to Stars Wars fans for $9.50 each as collector's items.
5YVwp TIL before clocks, there were candle clocks that when burned, indicated the passage of periods of time. To set an alarm, you pushed the nail into the desired point and the nail would fall and clank on the metal holder.
Me55b TIL that in Japanese baseball there is a tradition that when a great pitcher is retiring, their final opposing batters will strike out on purpose. The video is hilarious in its obviousness and truly touching as a show of respect for the player (Takashi Saito) and his career.