## Spin

An intrinsic property of particles. (That is, a property which does not change. Mass and electric charge are examples of intrinsic properties.) Spin is related to the usual notion of spin, though it is a little more difficult to understand. Spin comes in units of 1/2, so that a particle may have a spin of 0, 1/2, 1, 3/2, and so on. A particle's spin determines whether it is a Fermion or a Boson.

## Inspiration

Time writes no wrinkle
on thine azure brow,
Such as creation's dawn
beheld, thou rollest now.

Lord Byron's Childe Harold's Pilgrimage,
Canto IV,
Stanza 182