Is it the water? Perhaps the leafy streets and old houses is what draws them? Or maybe it is just that two Nobel winners wanted really good schools for their children. This morning a neighborhood just south of Towson woke up to find it had its second Nobel Prize winner, Adam Riess who will share the prize with two others for the discovery of the accelerating expansion of the universe through the observations of distant supernovae. Riess, 41, is an astronomy professor at Johns Hopkins University. Peter C. Agre, a Johns Hopkins School of Medicine biochemist, won in 2003 and lived in the neighborhood at the time as well.