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TIL polar bears have a black skin with a transparent fur to absorb the sun's heat. They appear white because the air spaces of each hair scatters the light in all directions.

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e0b7b TIL Cuttlefish have three hearts; one for oxygenating the body, and two to supply blood to their gills. Their blood is also blue-green.
X05Ar TIL that in 2005, a Ph.D. student at the University of British Columbia nominated a fire hydrant to run for the Board of Governors (and even acted as its "translator"). The hydrant pulled in 900 votes, missing a seat by six ballots.
l7Y7N TIL "cretinism" is an outdated medical term for congenital hypothyroidism, which can lead to mental impairment. It's most often caused by iodine deficiency, and over 100 countries mandate iodized salt as a preventative measure
x664b TIL of Dubay v. Wells (2006), a child support case. Dubay argued he should not have to pay child support for a child he did not want to parent. It was dismissed in appeals. Dubay was asked to appeal to the US Supreme Court, but Dubay declined.
n0KG TIL female elephants are frequently bisexual and use their trunks to do the nasty.