from the beginning of
our calendar
the era of
discoveries
- about year 0: water wheel
- 100: paper
- 680: modern system of numerals
- 1356: gunpowder
- 1455: printing
- 1492: discovery of America
- 1609: telescope and essential improvement of astronomical observations
- 1712: low pressure steam engine
- 1789: discovery of uranium (H. Klaproth)
- 1808: molecules consist of atoms (J. Dalton)