- 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 bigger the orange the sweeter sweeter it is.
- It took Leonardo Da Vinci 10 years to paint Mona Lisa.
- 111,111,111 x 111,111,111 = 12,345,678,987,654,321.
- The first metered taxi was introduced in 1907.
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