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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.

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781VL TIL about the town of Catatumbo where lightning strikes ~1.2 million times per year
4Maa TIL Scientists took advantage of the three-day flight ban over the US after 9/11 to conduct experiments on the effect on the atmosphere of jet planes. They found the days were a little warmer and the nights cooler, suggesting that the exhaust trails planes leave in the sky act like clouds.
1alGO TIL of Auguste Piccard, a Swiss physicist who invented a balloon and reached a record altitude of 9.8 miles in 1931. He then redesigned the balloon to be used underwater, and reached a record-breaking depth of 10,335ft in 1953.
9dQ TIL That According to the itunes User agreement, Once a user accepts It, Apple can use ‘Geo tracking’, it means that, once you agree, Apple is able to see your phones precise location.
XXXk TIL that the reason the movie industry is largely based in Hollywood, California was to evade the monopoly that Thomas Edison had at the time. Anyone not following his rules in his domain would be sued out of business.