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TIL that reindeer eyes change colour with the seasons. Reindeer eyes are golden in the summer and a vivid blue in the winter. This is due to physiological changes in the eye caused by pupil dilation in response to the Arctic's extremely low light conditions.

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XVy6 TIL Russian ice slides of the 17th century inspired the modern roller coaster. They were wooden structures often 70-80 ft high with ice frozen over a sloping ramp which stretched out 100s of feet. Riders ploughed into a pile of sand to slow them down.
OoDJ1 TIL Bonobos form all-female coalitions to target violent males as a counterstrategy against harassment.
x0Y7 TIL that the singular form of “spaghetti” is “spaghetto”
bwG7 TIL that the highest paid athlete of all time was a Roman Charioteer. If he had lived today he would have been worth $15 billion.
4X7Yg TIL of the mimic jumping spiders. Several species of jumping spider have evolved specifically to mimic the appearance and behaviors of ants. Many scientists believe this evolved as a way to avoid predation from larger spiders.