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TIL of the Shepard Tone, a musical technique that creates the auditory illusion of a tone that continually ascends or descends in pitch, yet which ultimately seems to get no higher or lower.

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jNeJv TIL a blood donor will lose around 650 calories by donating 1 pint of blood. That 1 pint of blood could save up to 3 lives.
R7NA1 TIL that a Greek man named Heron Alexandrinus, who was born in 10AD, invented the first steam engine, called an Aeolipile. His design was forgotten and never used until 1577.
QLA9 TIL the head Detective of the ritzy art-theft unit of the LAPD was given a surprise interrogation by fellow detectives about a murder she got away with over 20 years ago. Her facial and bodily reactions are intense, and afterward she was arrested for first degree murder.
Kby9 TIL That in 2014 there will be an attempt to go over a 1,000 mph. Which will break the sound barrier and set the world land speed record.
yQoo8 TIL a Baltimore school was evacuated and hazardous materials crews were called due to a strange odor. The source of the odor was a pumpkin spice air freshener.