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TIL: If you cut 2 different sponges up, disaggregate them (push them through a sieve), and mix the 2 cell-slurries together - the sponge cells reassociate with their own cells, but not cells of the other species. This is being studied to understand tissue repair and transplant rejection.
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TIL in 1962 a General Electric engineer named Nick Holonyak developed the first LED light bulb capable of emitting visible red light. The same bulb was used in the 1964 stop animation animated TV special Rudolph the Red-Nosed Reindeer for Rudolph’s bioluminescent nose.
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