  In this talk, I presented some of the results of the first calculation of
open bottom production at hadron colliders at NNLO+NNLL, i.e. a
next-to-next-to-leading-order calculation that resums collinear logarithms at
next-to-next-to-leading-logarithmic accuracy. This new computation achieves
significantly reduced theory errors compared to previous calculations, with
errors of just a few percent at high transverse momenta. These results are
compared to data from many measurements performed at the Tevatron, where
lower-order predictions have previously been found to underestimate the cross
section. To perform such comparisons, the hadronisation and decay of the
$b$-quark are included in the theory calculation where needed, yielding
predictions for a wide range of final states.
