You're sitting in physics class, working on a traditional problem involving forces and acceleration, when you start to wonder where these terms even came from. Were they just dreamed up to bring ...

A former NASA engineer working on a propellant-less propulsion drive has claimed that the device can deliver enough thrust to achieve lift in Earth's gravity, an effect which should not take place ...

There are some things in life that just sort of happen. Desks get covered in dust and scraps of paper. Clothes get dirty and the laundry basket fills up. Weeds slowly creep across an untended ...