- Hens do not need a rooster to lay an egg.
- Butterflies taste with their back feet.
- Tennis was originally played with bare hands.
- The Empire State Building in New York weighs over 365,000 tons.
- Chinese mathematics developed around the 11th century BC and included important concepts related to negative numbers, decimals, algebra and geometry.
- The first toothbrush was invented in 1498.
- There are only 3 sets of letters on a keyboard which are in alphabetical order (f g h, j k l, and o p).
- The center of the Sun is approximately 15 million C (27 million F).
- There are 2 credit cards for every person in the US.
- 1 gigayear = 1,000,000,000,000 years.
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