- In the 17th century Galileo Galilei and Johannes Kepler made important discoveries relating to planetary motion and orbits..
- 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..
- Hydrogen is the most abundant element in the Universe (75%).
- All the blinking in one day equates to having your eyes closed for 30 minutes.
- The Eiffel Tower is repainted every 7 years.
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