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TIL Gray wolves were reintroduced into Yellowstone National Park in 1995, resulting in regeneration of the entire ecosystem [Trophic cascade]. After the wolves were driven extinct regionally nearly 100 years ago, scientists began to fully understand their role in the food web as a keystone species.

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5Vxr9 TIL the amount of time between the first settlement of New Zealand by the indigenous Māori and their first contact with Europeans is shorter than the time between their first contact with Europeans and the present day. New Zealand was unoccupied by humans until 1320.
9w6VX TIL: In 2010, New Jersey lost $400 million in federal education reform money due to submitting data from the wrong school year. This lost them 4.8 points, making them fall 3 points short of receiving federal aid which went to Ohio instead. People have called this a "stunning $400 million mistake"
R7Nea TIL that a study of U.S federal courts found that on the Monday after the switch to Daylight Saving Time, when people lose sleep, judges gave sentences of on average 5% longer than normal
M71x7 TIL some bacteria evolved a needle-like structure for injecting other cells with special proteins. Type III secretion system , as it is called, is still poorly understood and we don't fully know how bacteria make them and how the needle itself works.
NJ1M TIL in the original 1900 novel “The Wonderful Wizard of Oz”, the Emerald City isn’t actually green; the Wizard requires everyone inside to wear green tinted glasses to make them think it is