When struck by light, the electrons in an atom of silver vibrate in a way that causes them to radiate small amounts of light themselves.

ECONOMIST: Solar energy

Since 2003, when Iran's nuclear program was first disclosed, the greater Middle East has seen an explosion of interest in the atom.

FORBES

He signed the letter to Franklin Roosevelt warning that it may be possible to build an atom bomb, and the letters of his famed equation relating energy to mass hover in our minds when we picture the resulting mushroom cloud.

NPR: Einstein: Relatively Speaking, a Complicated Life