'A law discovered by Galileo led Christian Huygens to build the 1st clock regulated by one of these'
a pendulum
TIME: A law discovered by Galileo led Christian Huygens to build the 1st clock regulated by one of these
A law discovered by Galileo led Christian Huygens to build the 1st clock regulated by one of these
A law discovered by Galileo led Christian Huygens to build the 1st clock regulated by one of these
TIME
a pendulum
TIME