  We computed the bottom-quark forward-backward asymmetry at the Tevatron in
the Standard Model and for several new physics scenarios. Near the $Z$-pole,
the SM bottom asymmetry is dominated by tree level exchanges of electroweak
gauge bosons. While above the $Z$-pole, next-to-leading order QCD dominates the
SM asymmetry as was the case with the top quark forward-backward asymmetry.
Light new physics, $M_{NP} \precsim 150$ GeV, can cause significant deviations
from the SM prediction for the bottom asymmetry. The bottom asymmetry can be
used to distinguish between competing NP explanations of the top asymmetry
based on how the NP interferes with s-channel gluon and $Z$ exchange.
