Because of the shell arrangements of electrons in various atoms and molecules, some substances are quite good at allowing a few electrons to move about freely (e.g., copper, silver, gold, aluminum), ...

The mathematics for properly designing ventilation and emission control systems have been around for quite awhile, but our studies of hundreds of systems show that many are wasting energy, while still ...

Jim al-Khalili and fellow physicists on the beauty and power of equations to describe and help understand the physical world. Show more Jim al-Khalili was sitting in a physics lecture at the ...