- The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, making it an irrational number. It never repeats and never ends when written as a decimal.
- Sea water is approximately 3.5% salt.
- Oysters can change from one gender to another and back again.
- Dark green lettuce leaves are more nutritious than lighter ones.
- A humming bird flaps its wings up to 90 times a second (5,400 times a minute).
- There are exactly 1,048,576 bytes in 1 megabyte.
- Flies can react to an object it sees and change direction in less than 30 milliseconds.
- Tennis was originally played with bare hands.
- The first sport to be filmed was boxing in 1894.
- Jack is the most common name in nursery rhymes.
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