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TIL our brain stems, inherited from amphibian ancestors, still spurt out odd signals producing hiccups that are essentially the same phenomenon as gill breathing.

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6NjW TIL Jonas Salk, a Polio researcher, chose not to patent his vaccine; instead, he gave it away for free, saving millions from the paralyzing, often lethal disease.
69gdZ TIL about Baltimore Jack. A 20 year old virgin gorilla, who captured so much attention that Hugh Hefner personally flew him to AZ on the Playboy Jet to get laid.
9w1w6 TIL: Rob Folp, creator of the infamously controversial game "Night Trap," went on to create the "Petz" series of games to make the cutest, most "sissy" game he could think of, after criticism from Captain Kangaroo.
GaJQ TIL in France it is illegal to gather information on the ethnic origin of its citizens therefore it is impossible to know the percentage of ethnic French who inhabit France.
6E0M8 TIL in 2005, Astronaut Stephen Robinson had to fix the Shuttle Discovery in orbit to make it to Earth alive. Material sticking out between the heat panels had to be removed to avoid burning up on re-entry. He improvised tools, including a saw made with duct tape, and removed it on a spacewalk.