I will discuss new and archival Chandra data for the cores of luminous, nearby X-ray clusters of galaxies. I will present striking evidence that the central AGN of clusters may be the key to solving both the "cooling flow" problem as well as the theoretical problem of "overcooling" (over-producing stars compared to the baryon content) in central dominant galaxies. The heating does not have to be constant to be effective and to be consistent with the data at all wavelengths.

Refreshments will be served in the Steward Observatory lobby at 3:30pm.