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TIL that when wooly mammoths went extinct, their territorial grassland was replaced with birch forests. This ushered in an age of forest fires so significant that it may have changed the global climate.

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P1J4J TIL about Sikh Nation - the largest blood donation campaign run by Canadian Sikhs to commemorate the tragic loss of thousands of lives in India’s anti-Sikh genocide in 1984. It has saved more than 160,000 lives and spread to 27 communities across the country since it began in 1999.
8aB4X TIL Julia Louis-Dreyfus' family owns and runs one of the richest companies on earth, the Louis Dreyfus Company. They have over $120 Billion in gross sales per year and have companies in over 100 countries. Her father was a billionaire.
Mmv8 TIL that six years after Martin Luther King was shot and killed, his mother was also shot and killed, in the Ebenezer Missionary Baptist Church, Auburn, Alabama.
J1Qyj TIL that "semi-slugs" exist. Their shells are not completely absent but are also not large enough to provide a shelter to hide in. There are also about 1,000 known species of semi-slugs, while there are 500 known species of "normal" slugs.
Z89BQ TIL the Queen owns all of the U.K.'s swans. Every year there is an annual census of all the swans in the River Thames, a centuries-old tradition known as the Swan Upping that takes place the third week in July. This years Swan Upping started today.