A baby whale is called a calf. Whales form groups to look after calves and feed together. These groups are often made up of all female or all male whales.

The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, this means it is an irrational number. When written as a decimal it never repeats and never ends.

The term rookies comes from a Civil War term, reckie, which was short for recruit.

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