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TIL that arguably the person credited with saving the most lives in human history is WWI chemical weapons scientist, Fritz Haber. His work directly lead to the deaths of hundreds of thousands during the war, while accidentally saving billions from starvation by developing a way to convert N2 to NH3.

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dDEp7 TIL about shotgun houses - narrow rectangular houses about 12 feet wide that were popular in the Southern United States from the end of the American Civil War through the 1920s.
kOj7g TIL com­pos­ing and ar­ran­ging mu­sic is partly ge­net­ically de­term­ined. Up to 30 percent of a musician's ability to compose and arrange music can be explained by genes in the cerebellar LTD pathway.
BgNOx TIL of the walking catfish, which is able to breathe air and use its pectoral fins to "walk" and move to different aquatic environments. Native to Southeast Asia, it became an invasive species in Florida during the 1960s and has been sighted in California, Connecticut, Georgia, and England.
4kv4g TIL Amy Macdonald is a footballer's wife.
5VeVr TIL a child under five of unknown parentage found within the United States is considered to be a US Citizen at birth, unless shown otherwise before their 21st birthday, per 8 U.S. Code § 1401.