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🔬 Know a Scientist - Christiaan Huygens
- Christiaan Huygens lived from 1629 to 1695.
- He invented the pendulum clock in 1656 .
- He patented it in 1657.
- He was inspired by Galileo Galilei (1564–1642).
- Galileo once watched a swinging lamp in a church.
- He used his pulse to measure time and found each swing took the same time.
- Galileo concluded that a pendulum's swing time depends only on its length.
