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TIL that sea urchins are devastating the US West Coast's vital kelp forests. Since 2014, their population has increased by 10,000%, and in Northern California, over 90% of the giant bull kelp forests have been destroyed. The "urchin barrens" that are left are killing off important fisheries.

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R5lbQ TIL Between 1975 and 2010, the population of India doubled to 1.2 billion, reaching the billion mark in 2000. India overtook China to become the most populous country at the end of April 2023. India's population stands at slightly over 1.428 billion, edging past China's 1.425 billion people.
km4 TIL Iceland was officially treated by UK as a terrorist country in 2008.
xVa5B TIL Foo Fighters used to publicly support HIV/AIDS denialism group Alive & Well AIDS Alternatives. Both the group's founder and her infant daughter died of AIDS-related conditions.
a8vBN TIL that photons created in the center of the sun take a few thousand years to a few million to reach the surface of the sun and then only 8 minutes to reach Earth as light.
GG5G TIL for whatever reason, a German WW2 submarine captain decided not to call the trained technician and tried to operate the complex flush system himself after he had used the lavatory. He flooded the boat, forcing it to surface, where it was promptly spotted by the enemy and bombed out of the water.