- Natural gas has no smell (the odor is artificially added so that people are able to identify leaks).
- Dinosaurs lived on Earth for over 165 million years before they became extinct.
- Greek philosopher and mathematician Pythagoras lived around the year 500 BC and is known for his Pythagorean theorem relating to the three sides of a right angle triangle: a^2 + b^2 = c^2.
- 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..
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