- Only about one-ninth of the mass of an iceberg is visible above the water. Nearly all its bulk remains hidden beneath the surface.
- There are no cemeteries in San Francisco, Calif.
- The risk of being struck by a falling meteorite for a human is one occurrence every 9,300 years.
- China has been under communist rule for 60 years.
- New York City was briefly the U.S. capital from 1789 to 1790.
