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TIL: Pufferfish create intricate underwater crop circles as part of their mating ritual.

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WknX TIL in 1970 a disgruntled postgraduate student deliberately infected his roommates with Ascaris suum, a parasitic nematode. This was the first documented human infection by this species.
0eJN TIL that you are more creative when you are tired or drunk
mxQaY TIL that CFO Magazine stopped giving out its annual Excellence Awards in 2001 because the three previous winners had all gone to prison
WZML TIL that Tenochtitlan was possibly the highest populated city in the world before its fall, with 5 miles of aqueducts, a ten mile levee, and one of the most complicated class systems in the world at the time. Cortés of Spain leveled the entire city in 75 days.
m1aEv TIL frogs can see individual photons, the smallest possible particles of light. Even the faintest sources like distant stars appear as individual points of light not as a continuous stream but as separate flashes. To test it single photons were fired at photoreceptor cells triggering a nerve impulse