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TIL that a study from 2016 identified an overall 57% diminution in mean sperm concentration over the past 35 years in North America, Europe, Asia and Africa. Reports in South America indicated no significant alteration. An increasing trend of sperm concentration was identified only in Australia.

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oBaBR TIL that adult luna moths do eat as they do not have a mouth or a digestive system. Their short, week long life as adults is spent entirely looking for a mate, running only off the fat reserves from the larval stage.
obNr TIL there is a jellyfish whose sting will leave you with and “Inpending sense of doom” and suicidal thought lasting up to two weeks
x6oaB TIL of the Hummingbird Hawk-Moth, a moth that bears remarkable resemblance to a hummingbird - even consuming nectar from the same type of flowers in the same manner. There is no genetic relationship between the two.
Bj5d TIL of Baker’s Math: flour weight is always expressed as 100%, and sets the foundation for every other ingredient- 66% water, 2% salt, etc.
mx6wM TIL that One of Harvard College’s first buildings was a brewery. The college built it so that students would have a good supply of beer to drink in the dining hall.