Christmas trees; caulking a leaky window

Landscape contractor Roger Cook is on a special mission to pick the perfect Christmas tree at a local tree farm. In the ASK THIS OLD HOUSE loft, Roger shares a few tips for keeping Christmas trees healthy throughout the holiday season. Then, Roger, host Kevin O'Connor, plumbing and heating expert Richard Trethewey and general contractor Tom Silva try to answer the question, "What is it?" Tom makes a HOUSE call in Florida to show a homeowner the proper way to caulk a leaky window.