• Until 1921 the American Medical Association had a separate medical reference for how to treat Jews and African-Americans.

• 18 percent of postage stamps sold by the Royal Mail in Great Britain government will never be used.

• When the first commercial, electronic toaster appeared in 1917, the New York Times called it "this year's greatest invention," and said it was "the hallmark of a fantastical new era."

• One in seven people suffer from chronic bad breath.

• Human brains compress visual input before processing it. The raw information coming from the optic nerve is roughly one thousand times more detailed than what is ultimately perceived.