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TIL that it was calculated that it would have taken the concrete for the Hoover Dam 125 years to cool if it was poured as one continuous pour. Instead giant concrete blocks in columns were poured and then cooled by a series of internally contained pipes of cold water, greatly reducing cooling time.

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x5x0 TIL that an analysis of Justin Bieber’s Twitter followers found that around 50 percent of them are probably fake. The criteria for determining if an account was fake included whether it was used to tweet phrases such as “diet,” “make money” and “work from home.”
d8Ad9 TIL that on the WWII memorial in Washington DC, in an unassuming spot there is a drawing of ‘Kilroy Was Here’ which was a meme of the time.
8egna TIL Dolphins call each other by ‘name’ using a unique whistle to identify each other. They only respond to their own names, by sounding a distinct whistle back. Researchers believe dolphins are acting like humans: when they hear their name, they answer.
pY8Wb TIL Joshua Trees are not actually Trees, but Succulents. However, they are considered trees of the desert.
ne9Er TIL there's a Buddhist majority republic in Europe called Kalmykia. It's part of Russia, many inhabitants are ethnically Mongolian and it's capital features several beautiful Buddhist temples.