Ancient Romans at one time used human urine as an ingredient in their toothpaste.
37
In 2011, a couple bought a box of textbooks for $10. Inside, they found a 25-cent bill signed by the president of the Republic of Texas, Sam Houston, and subsequently sold it for $63,250.
13
The U.S. motto, 'In God We Trust', was not adopted as the national slogan until 1956.
72
A B-25 bomber airplane crashed into the 79th floor of the Empire State Building on July 28, 1945.
30
A female photographer in the 50s took tens of thousands of pictures and remained remained unknown until her death. She is now considered one of the most important street photographers ever.
20
India invented the Number System. Zero was invented by Aryabhatta.
59
The life expectancy in 1900 was just 47 years.
49
In 1980, the city of Detroit presented Saddam Hussein with a key to the city.
29