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TIL that most oxygen actually comes from the ocean as opposed to trees. (70%)

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BPWK TIL that dueling is still technically legal in Texas, because mutual consent is a defense against assault.
Eg8ZX TIL the "OMG" cosmic ray was (probably) a proton travelling at 99.99999999999999999999951% of the speed of light. It would take 215,000 years for a photon to gain a 1 centimeter lead on this proton.
KOD1w TIL Throughout the world boys are lagging in overall achievement. "It's tough for all kids to sit down and pay attention for six, seven hours but it's generally harder for boys"
rRd91 TIL Walmart used to take out life insurance policies on their employees and keep the payouts when they died, a practice colloquially known as “Dead Peasant Insurance”
rRoly TIL It has been a hotly debated subject for decades whether or not the presumed oldest musical instrument was purposefully crafted bone flute, or a cave bear femur which an animal chewed on