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TIL the manchineel tree, one of the deadliest plants on Earth, produces a sweet, apple-like fruit that’s highly toxic. Native to the Caribbean and Florida, its sap causes severe burns and blistering on contact, and even a taste of the fruit or inhaling smoke from its wood can be fatal.

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loKO1 TIL A 2008 review of 11 studies found flossing was no more effective than brushing alone in reducing plaque or gingivitis. A 2011 review found "some evidence" from 12 studies, and "weak, very unreliable evidence from 10 studies" that it did. The US government stopped recommending flossing in 2015.
78V4X TIL Orca whales...are actually dolphins.
kEV1 TIL - The size that acorns grow to is partly dictated by how large the mouths of birds and squirrels are - if the acorns grow too large the animals can’t disperse them away from the tree which is critical for germination an seedling growth
mxoGE TIL In 1992, a hurricane hit Hawaii where they were filming "Jurassic Park." Spielberg's crew had to be evacuated via helicopter; the pilot, Fred Sorenson, had previously met Spielberg while playing the pilot in the opening scene of "Raiders of the Lost Ark"
Z8PdR TIL that, in humans, there is a secreted protein that is literally called “Sonic hedgehog”