- Sun light can penetrate clean ocean water up to a depth of 73m (240 feet).
- A blue whale can weigh as much as 30 elephants and as long as 3 large tour buses.
- The most sung song is happy birthday.
- Swiss mathematician Leonhard Euler was probably the most influential mathematician of the 18th century, making discoveries in graph theory and introducing many modern mathematical words and notations among other things..
- The croissant was invented in Austria.
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