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TIL the roundels on WW2 RAF planes indicate the type of plane

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W7vN8 TIL that the true color of the sky is violet. Earth's atmosphere scatters shorter wavelengths, like blue and violet. However, our eyes are more sensitive to blue and less to violet, so we see the sky as blue.
jRWN TIL, if you’re like most drivers, you have your mirrors adjusted unsafely. They should be adjusted far outside so that you can’t see your car at all to get rid of “BLIND” spots.
woXxY TIL The most powerful wind turbine generator worldwide today generates 14,7MW of electricity. It was developed for offshore wind farms
1a4mV TIL that sleeping on the job, while frowned upon in many countries, is socially accepted in Japan
G5pJ TIL after a Federal Reserve interest rate decision in 2013, trades were registered in the Chicago stock market within 2 milliseconds of the announcement. These trades were later found to be insider trading, as this information would take 7 milliseconds to reach Chicago at the speed of light.