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TIL that the blue light exposure from a monitor is about 100 times below the international recommended limit. The spectrally weighted irradiance from computer screens and mobile devices is a lot lower than the natural exposures.

Read more ncbi.nlm.nih.gov

via reddit.com

lO67 TIL: 73939133 is the largest known prime number that, if you keep removing digits from the right, will always leave a prime number.
4Nao TIL Curb Your Enthusiasm saved a guy from murder charges. Outtake footage of an episode taking place at Dodgers stadium showed the accused in the crowd, some 20 miles from the crime scene at the time of the murder.
KOBNR TIL that Robert Morris, namesake of Robert Morris University, engaged in the trans-Atlantic slave trade and personally owned several slaves.
A4N4 TIL The town of Dull in Scotland has been twinned with the town of Boring, Oregon since 2012. In 2013 the town of Bland, Australia joined them in what has become known as the ‘Trinity of Tedium’.
j6NEQ TIL that fireflies are facing extinction in the United States.