The system for leveling out the ceiling in the open kitchen and the floor in the finished basement is explained; and a hole is cut for a new window. Also: landscape architect Cricket Beauregard explains her vision for the shady front yard. In the second half: "waffle gardening," which is a method of growing vegetables in an arid climate, is explained; mechanical dampers are added to a forced-air heating system; and a way to bisect angles is demonstrated.