TIL deep-water fish get the bends when they are reeled in too fast. Sports fishermen unintentionally kill millions of fish each year due to the condition called barotrauma.
TIL About Einstein's "Year of Miracles". In one year he published 3 papers that changed modern physics. The first about the particle theory of light (won him his Nobel Prize), the second led to people accepting the existence of atoms, and the third introduced special relativity (E=mc^2). He was 26.
TIL aquariums aren't allowed to pay to get animals from other aquariums as it encourages poaching. So there is a barter system in place where they swap animals. A New England aquarium traded a dozen penguins for 800 mackerel and their basic unit of trade is the jellyfish
TIL that after 20 years in a coma, a man was claimed to be aware and suffering from locked-in syndrome. These claims were proven to be a hoax.