The tick-tick sound comes from the movement of gears and parts inside the clock. In mechanical clocks, a part called the ...

The familiar tick-tock of wall clocks originates from the escapement mechanism, which controls gear movement in precise steps. While our brains perceive two distinct sounds, clocks actually produce ...

The sudden onset of tics and tic-like behavior likely have to do with stress and certain types of social media use. Credit: martin-dm / Getty Images Every year, children and their parents seek medical ...