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TIL that the first heartbeat in zebrafish embryos begins abruptly and in sync across all heart cells, a process likened to an army starting to march in perfect unison without prior practice.

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XkZR TIL for every American soldier killed by enemy combatants, approximately 25 other soldiers ended their own lives.
P178n TIL: The Sedlec Ossuary contains the skeletons of between 40,000 and 70,000 people, whose bones have been artistically arranged to form decorations and furnishings such as a bone chandelier. Some arrangements were by a half blind monk in 1511. It is now a tourist attraction and featured in movies.
5wAn TIL this man owed $134 in property taxes. The District of Columbia sold the lien to an investor who foreclosed on his $197,000 house and sold it.
VMrk0 TIL that it takes only 8-minutes for sunlight to reach the Earth, but can take up to 170,000 years for it to travel from the Sun's core to its surface. This is because the photons travel in a nonlinear path known as a random walk process - looks pretty similar to a convoluted zig zag.
P9RZ TIL that Joe Pesci released an entire album where he sings as Vinny from My Cousin Vinny.