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TIL that during WWII, the British MI5 used a "double cross system" to turn German spies into double agents, misleading the Germans about the D-Day invasion's location and timing, which contributed significantly to its success.

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VM1R8 TIL The longest lived domestic cat was named Creme Puff. She lived from August 3, 1967 to August 6, 2005, a span of 38 years and 3 days. This is well over double the normal life span for domestic cats, which is typically around 12-14 years for males and 13-15 years for females.
GAR5g TIL Crown shyness is a phenomenon in which the trees do not touch each other. The phenomenon is most prevalent among trees of the same species, but also occurs between trees of different species.
5YAxR TIL there are "combat dolphins" used by many naval forces in the world. They seek mines, look out for intruders, and locate/tag lost equipment. These dolphins can tell the difference between stainless steel, brass, or aluminum pipes that are buried over two feet in mud in the ocean floor.
Da9r TIL that during WWII Congress imposed an “Excess Profits Tax” to keep corporations from profiteering from war. This is not the case today.
V8kZ TIL players of an online game called Foldit resolved the structure of an enzyme in just three weeks.