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), ...

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 ...

Jim al-Khalili was sitting in a physics lecture at the University of Surrey when he suddenly understood the power of equations to describe and predict the physical world. He recalls that sadly his ...