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"This simulation shows a simple pendulum operating under gravity. For small oscillations the pendulum is linear, but it is non-linear for larger oscillations. You can change parameters in the simulation such as mass, gravity, and friction (damping). You can drag the pendulum with your mouse to change the starting position."

"Clad in a blue jumpsuit and waving, crew member Sukhrob Kamolov quipped "See you in 520 days!" before hopping into sealed-off chambers Thursday with five other men taking part in a simulated trip to Mars."

"NTNUJAVA Virtual Physics Laboratory Physics Simulations to help you enjoy the fun of physics!"

Fun, interactive, research-based simulations of physical phenomena from the PhET project at the University of Colorado.

"Scientists have simulated the sounds set to be made by sub-atomic particles such as the Higgs boson when they are produced "

"A team at the Carnegie Institution for Science subjected the material to pressures up to 1.4 million times atmospheric pressure at sea level, and temperatures up to 2,200C. They found that it pulls off the trick of changing its electrical properties without any shifting of shape - it can be an insulator or conductor depending just on temperature and pressure. Combined with computer simulations of just what was going on with the material's electrons, the group claim that the results show a new type of metallisation. "At high temperatures, the atoms in iron oxide crystals are arranged with the same structure as common table salt," said Ronald Cohen, a co-author of the study. "Just like table salt, iron oxide at ambient conditions is a good insulator-it does not conduct electricity.""

"Six would-be astronauts will this week begin a 520-day mock space voyage to simulate a mission to Mars. How will they cope with the huge psychological pressures?"

How does a lens form an image? See how light rays are refracted by a lens. Watch how the image changes when you adjust the focal length of the lens, move the object, move the lens, or move the screen.

Building a trebuchet from scratch and finding the best proportions, weights, angles etc by trial and error certainly works ..well, that's how the Grey Co's first machines were done... but if you could model the rock-throwing beasts mathematically then think of the work and possibly wasted effort you could save.

On the physics and mechanics of a medieval trebuchet, a type of catapult, its design, working and optimization through improved simulation and mathematical analysis.