Everything around us is made of 'stuff', from planets, to books, to
our own bodies. Whatever it is, we call it matter or material
substance. It is solid; it has mass. But what is matter, exactly?
We are taught in school that matter is not continuous, but
discrete. As a few of the philosophers of ancient Greece once
speculated, nearly two and a half thousand years ago, matter comes
in 'lumps', and science has relentlessly peeled away successive