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TIL of Musical Ear Syndrome, a for of tinnitus that causes one to hear music with no external source. The music can be a single instrument playing a simple melody or a complex arrangement of instruments, including vocals.

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nWN17 TIL Rotational detonation engines are expected to replace rocket engines for space flight.
rm9x TIL that in 1987, 7 million American children simply vanished. The reason? The IRS started requiring the Social Security Numbers of dependents on tax forms
YxXA TIL it would take over 9.4 million typical party balloons to lift Carl’s house, in the Disney Pixar movie “UP”
eGE5 TIL that the Chinese city of Guangzhou had no subway whatsoever 20 years ago. Today, its subway system has 186 stations and is 191 miles/307 km long. It is today the world’s fourth busiest metro system, beating New York’s, London’s, Moscow’s and Paris’ in terms of ridership.
G7BQ TIL the Chinese are twice as willing to purchase products “Made in America” than Chinese products.