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TIL President Abraham Lincoln exchanged many letters with Karl Marx, and the two men considered themselves friends. Marx, a journalist at the time, wrote extensively about the Civil War and its significance to the struggle of workers and oppressed people about the world

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yVrwa TIL About the “Flynn effect reversal”. The Flynn effect refers to the observed rise in IQ scores throughout the 20th century, but in the last few decades, some research indicates that this trend has reversed in certain regions, particularly in Western countries.
oBgxE TIL - In 2013 a company create an ‘electric backpack’ that attaches on the back of a cockroach allowing it to be controlled by a mobile phone app.
D1XGg TIL in 1800s, freed African-American slaves were helped to migrate to Liberia to escape oppression into a country of their very own, where they immediately established an apartheid upon their native African cousins, treating them the same way they were treated by their white oppressors.
GYVbE TIL Ulysses S. Grant, 18th president, was penniless in old age and wrote a book of memoirs so his wife could live off of the royalties. Mark Twain heard the best offer was 10% and immediately offered the former president 75%. The book was a success, giving Grant's widow about $450,000 in royalties.
NQbb TIL the largest diamond discovered in the world, the Cullinan was shipped from South Africa to England in a postal box while a replica was shipped on a steamer to create diversion