British researchers have found that there is a side effect of the release of a new Harry Potter book: empty emergency rooms.  Children visiting emergency rooms in Britain dropped by HALF on summer weekends when the books were released.  The article has a nice sense of humor combined with the results, though I would quibble with their assumption that if kids read more they will be less active.  I think that if kids read more they will watch less TV, and that is always a positive tradeoff.