1. In what ways are electromagnetic and color charges similar and different?
2. The fact that the photon is massless makes the electromagnetic interaction one of long range. If the gluon is also massless, why is the strong color interaction also not of long range?
3. Suppose you have two dice, each of which you are going to rotate in some prescribed manner. Is the finite rotation of one die an Abelian or a non-Abelian operation? Is the choice of which die to rotate first an Abelian or a non-Abelian operation?