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TIL that if you look at a blue sky you can actually see white blood cells moving around in your eyes.

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nyMb TIL that the word “Amazon” in ancient Greek means “without a breast”, referring to the legend that Amazons (strong, independent women warriors) cut off their right breasts so as not to interfere with use of a bow.
ln5N TIL There is a naturally pink lake in Australia
G0LN TIL that in 2012, Walmart held a contest, in which the rapper Pitbull would perform in a Walmart with the most likes on its FB page. After the #ExilePitbull Twitter campaign, the shop in the remote island town of Kodiak, Alaska, ended up winning.
VGKD TIL that US President James Buchanan never married. As a result his niece served as First Lady during his presidency.
aPPN TIL If two identical clocks were set to the same time, one on top of Mt. Everest and one at sea level, 4.6 billion years ago when Earth was formed, there would be a 39 hour difference between them today due to gravitational time dilation.