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TIL Sunscreen SPF is a very nonlinear metric. An SPF of 15 blocks 93% of incoming radiation, SPF 30 blocks 97%. SPF 50 blocks only 1% more than SPF 30, at 98%.

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JdMV TIL That the Beats audio driver included with some laptops actually makes the sound worse than stock when you turn it off, to make the beats ‘enhancements’ sound better by comparison.
R7koj TIL that in 1959, Rena Kanokogi disguised herself as a man, entered a men's judo competition and won first place. Her medal was taken away after her victory when she admitted to being female, but it was awarded back to her in 2009.
nWmEB TIL Elvis Presley was a twinless twin. His would-be twin brother was stillborn 35 minutes before Elvis was born.
aawy TIL of the Atmos clock, a mechanical torsion pendulum clock which gets the energy it needs to run from temperature and air pressure changes in the environment, and can run for many years without human intervention. A temperature variation of only 1 degree is sufficient for two days operation.
PX0E TIL That ‘District 9’ is the outcome of the failed 'Halo’ movie