During the Cold War, the US had planned to detonate a nuclear weapon on the moon.
25
The life expectancy in 1900 was just 47 years.
49
Vikings used the skulls of their enemies as drinking vessels.
169
Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
153
In 1963, the US Military created an artificial ring around Earth, similar to that of the planet Saturn. The ring was made of copper needles and was used for worldwide communications in the case that the Soviets disabled all other methods of communication.
26
Leonardo da Vinci could write with one hand and draw with the other at the same time.
56