The first Foucault’s pendulum I ever saw was at the Franklin Institute in Philadelphia, the city where I was born. The pendulum hung in a stairwell. Its wire was attached to the ceiling four stories ...

In 1665, the Dutch researcher Christiaan Huygens (1629-1695) was working on a novel clock for ships. At the time, pendulum clocks were the state of the art, and a specially shaped pendulum was ...

Peaks of energy dissipation arising from distortions of a charge density wave have been observed by oscillating the tip of an atomic force microscope a few nanometres above a surface of a layered ...

When oscillating, the pendulum slowly shifts between torsional and vertical modes of oscillation. When stretched down, the spring applies a torque to the mass to help it unstretch. When compressed up, ...