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TIL all mammals have around one billion heartbeats in their lifetime

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DOlD TIL that we are in the middle of the sixth mass extinction called Holocene extinction
4kKb5 TIL The Richest Athlete of All Time Did Nothing With His Wealth and Vanished Into History
mxk8M TIL: Cuba provides more medical personnel to the developing world than all the G8 countries combined
JYvek TIL about the Berkeley Pit, a 270-metre deep US "lake" filled with liquid toxins and acid. Thousands of geese died upon landing in it one night; today, birds are scared off the site with gunshots. The state of Montana charges every visitor to the lake 2 dollars. It has its own gift shop.
mxDPv TIL Glaucoma is almost always caused by too much pressure inside one or both eyes. People don’t typically experience symptoms until the optic nerve has already been damaged and glaucoma usually occurs later in life, but it can happen at any age