- The first crossword puzzle appeared in 1913.
- The word 'lethologica' describes the state of not being able to remember the word you want.
- There are 7 points on the Statue of Liberty's crown.
- A full moon is nine times brighter than a half moon.
- The wheelbarrow is invented in China.
- The Hindu-Arabic numeral system began developing as early as the 1st century with a full system being established around the 9th century, forming the basis of the numerical digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 that we use today.
- Fibonacci numbers are named after Italian mathematician Leonardo of Pisa (better known as Fibonacci) who introduced them to Western Europe after they had earlier been described by Indian mathematicians. They are related to the golden ratio and proceed in the following order: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, .... Can you see the pattern?.
- A group of frogs is called an army.
- A human being could swim through the blood vessels of a blue whale.
- Penguins mate for life and both parents care for their young.
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