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TIL that the blood type O was originally designated as C by Karl Landsteiner who discovered three distinct blood types naming them A, B and C. Type C was later changed to O to reflect its unique property of having no antigen sites on its surface.

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69MXZ TIL that the IAU (International Astronomical Union) only recognizes 88 official constellations. Any pattern of stars that is not one of the 88 official constellations is called an asterism, with the most well-known ones being the Big Dipper, the Little Dipper, Orion's Belt, and the Summer Triangle.
LQok9 TIL of “Raining Blobs in Oakville,”a phenomenon that occurred in Oakville, Washington, in 1994, where gelatinous blobs fell from the sky. These blobs contained human white blood cells and made people ill, though their origin remains a mystery.
rRyo0 TIL: That 'Waze' is a homophone of 'ways'; as it figures of ways through traffic.
newAo TIL that 50% of people have a trait that gives them goosebumps and chills when listening to powerful music which is caused by a stronger connection between the auditory information and emotion centers in your brain.
696vW TIL that Amanda Knox, while imprisoned, was falsely told she had HIV. This led her to list her sexual partners, which then leaked to the media. This incident is seen as a possible strategy by authorities to probe her personal life for a possible accomplice in the Meredith Kercher murder case.