Sand on a dune possesses energy in the form of gravitational potential energy. The greater the height of the sand dune, the more gravitational potential energy the sand on top has. When the sand on top of a steep dune is disturbed, it slides down the slope, and gravitational potential energy is transformed into kinetic energy. It is this kinetic energy of the falling sand that produces the booming sound. As the sand particles bounce against each other, some of their kinetic energy is transformed into acoustic energy — or sound, waves of vibrations transmitted through a medium.
Tel-Aviv University demos quantum superconductors locked in a magnetic field (www.quantumlevitation.com). For an explanation of the physics behind this demonstration, visit http://www.quantumlevitation.com/levitation/The_physics.html.
Internet pioneer and UCLA computer science professor Leonard Kleinrock discusses the process of connecting the first host computer to the fledgling Internet, then known as the ARPANET, in September 1969, and sending the first host-to-host message a month later on October 29, 1969.
Walt Disney Studios developed instructional videos for national defense training.
Chris Packham from the BBC puts a northern goshawk through its paces in the lab.
The aerodynamics (downforce) of an F1 car is so powerful it could drive on an inverted road (upside-down) if it was going only 170kmh or 105mph!