The native Americans planted three sisters (corn, beans, and squash) together so that they would benefit each other. The corn provides a structure for the beans to climb. The beans provide the nitrogen to the soil, and the squash spreads along the ground preventing weeds.
30
Originally, Du Pont, Inc. was a tiny gun powder mill in New Jersey.
20
The time interval from first sighting of the iceberg that sank the Titanic to impact was a little over 30 seconds.
105
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
Harry S. Truman was the last U.S. President with no college degree.
55
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13