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TIL that all sperm whales in the world descended from just one female who lived tens of thousands of years ago

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QNDvM TIL about the 1936 Literary Digest Presidential Poll which was so wrong it destroyed the magazine's credibility. It projected Republican Alf Landon to defeat Incumbent Franklin Roosevelt easily. Roosevelt ended up winning 48 states and the popular vote by 24 percentage points
NeRe TIL that 550,000 female fetuses a year are selectively aborted in India in a practice referred to as Female Foeticide.
V5J4 TIL there is an optical microscope which is assembled from a single piece of paper and a lens, costing less than $1 to build. It can magnify up to 2000 times and weighs 8 grams.
8P5V TIL there are 550,000 miles of flexible undersea cables that carry the world’s data. Both USA and UK government agencies tap directly into it
vPZbL TIL there's an Underground river beneath the Amazon River, it was discovered in 2011 and its about as long as the Amazon river, but it is much broader. It's unofficial name is the Rio Hamza