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TIL In Greece’s fight for independence, a Turkish garrison in Acropolis was besieged by Greek fighters. When the Turks ran low on bullets, they began to cut the marble columns to use the lead within as bullets. The Greeks sent them ammunition saying: “Here are bullets, don’t touch the columns.”

N7RDJ TIL the name of 1997 film "Gattaca" is based on the letters G, A, T, and C, which stand for guanine, adenine, thymine, and cytosine, the four nucleobases of DNA.
brYN TIL that in order to study a cow’s digestion, research cows are fitted with a port in their side big enough to see and reach into so that scientists can gather the contents inside without hurting the cow. The cow lives a normal life and can actually live longer than a regular cow.
BgrVx TIL in 1963, a leaking propane tank was ignited by a nearby popcorn machine at a "holiday on ice" show in Indianapolis. The explosion killed 74 people and ripped open a section of the seating bowl.
E1mxV TIL, The SS Great Eastern, a ship designed in 1854 by Isambard Kingdom Brunel once struck a rock, causing a 83ft long hole. The passengers never noticed. 58 years later a hole just half the size sunk the Titanic.
VBwvD TIL about Leonhard Euler (1707-1783) who not only popularised the use of lower case Pi to denote the ratio of a circle's circumference to it's diameter, but was also the first to use "i" to denote the square root of -1. The constant "e", the base number in a natural logarithm is the Euler Number