What can a pendulum do?

A pendulum is any small object attached to a piece of string or thread that sways freely by the force of gravity. The pendulum, since the time of astronomer Galileo in the 1600s, has been used to study the forces of gravity and to tell time. But we are going to talk here about the uses of the pendulum beyond technical science. In ancient Rome and Egypt, the pendulum was used to find underground water and to tell the future. […]

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