  This proceeding overviews our current understanding of the orbital history
and mass of the Large and Small Magellanic Clouds. Specifically I will argue
that the Clouds are on their first infall about our Milky Way and that their
total masses are necessarily ~10 times larger than traditionally estimated.
This conclusion is based on the recently revised HST proper motions of the
Clouds and arguments concerning the binary status of the LMC-SMC pair and their
baryon fractions
