› added 7 years ago

370

They definitely get the blues

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4X8ea TIL that the huge Lake Kivu is one of three lakes known to have limnic eruptions, natural disasters that create CO2 gas clouds that wipe out life in the area. It takes place every 1000 years or so and 2 million people now live in the vicinity.
57Jn TIL that within a week after the “Raising the Flag at Iwo Jima” picture was taken. Half of the men in the picture were killed in combat.
YwAr TIL NASA recovered metal from the World Trade Center and used it on Martian rovers as a tribute to those fallen on the 9/11 attacks
1kdV TIL Will Purvis, who was convicted of murder in 1894 and had always maintained his innocence, told the jury he would “live longer than the lot of them”. He survived a hanging, was re-incarcerated, and eventually pardoned and released. He died in 1938, three days after the last juror had died.
awEYM TIL that time of flight (ToF) sensors in our modern smartphones actually bounce a signal off the object in front of it and record how long the signal takes to return to the sensor in order to measure distance, kind of like radar