Roller coasters rely on two types of energy to operate: gravitational potential energy and kinetic energy. Gravitational potential energy is the energy an object has stored because of its mass and its ...

One of the first “roller-coaster” rides in the U.S. was actually a short coal railway in Pennsylvania that hauled coal downhill between mines and used mules to bring the empty cars back up the hill.

Leftover tiles from renovation projects don’t have to gather dust in storage or end up in the trash. Those ceramic, marble, glass, and porcelain remnants can transform into beautiful, functional ...