1. The 1912 Olympics was the last time that gold medals were solid gold.
Since then, they’ve been silver with gold plating.
2. Automobile transmissions used whale oil up until 1973.
3. The 2nd president of the United States (John Adams) and 3rd president of the United States (Thomas Jefferson) both died within just a few hours apart of each other on the same exact day of July 4th 1826. They are the only two presidents to die on the same day of the same year.
4. Barbers at one time combined shaving and haircutting with bloodletting and pulling teeth. The white stripes on a field of red that spiral down a barber pole represent the bandages used in the bloodletting.
5. Coral (pro osteon) has molecular architecture and chemistry similar to human bone and so it can be used to replace bone grafts, helping bones heal faster. 150-200 pounds of it can sustain hundreds of graphs