  We discuss two themes from Chandra observations of galaxies, groups, and
clusters. First, we review the merging process as seen through the high angular
resolution of Chandra. We present examples of sharp, edge-like surface
brightness structures ``cold fronts'', the boundaries of the remaining cores of
merger components and the Chandra observations of CL0657, the first clear
example of a strong cluster merger shock. In addition to reviewing already
published work, we present observations of the cold front around the elliptical
galaxy NGC1404 which is infalling into the Fornax cluster and we discuss
multiple ``edges'' in ZW3146. Second, we review the effects of relativistic,
radio-emitting plasmas or ``bubbles'', inflated by active galactic nuclei, on
the hot X-ray emitting gaseous atmospheres in galaxies and clusters. We review
published work and also discuss the unusual X-ray structures surrounding the
galaxies NGC4636 and NGC507.
