- Silly String was originally designed to be a spray on cast for broken bones.
- Mercury and Venus are the only planets in our solar system with no moon.
- Cows can walk up stairs but not down them.
- The Earth weighs 6,588,000,000,000,000,000 tons.
- Natural gas has no smell (the odor is artificially added so that people are able to identify leaks).
- Dry ice transforms directly from being a solid to a gas.
- The average pool cue is 1.4m (4.75ft) long.
- The $ sign was introduced in 1788.
- Police dogs are trained to respond to commands in foreign languages (usually German or Hungarian).
- The longest alphabet has 74 letters.
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