After the snow finally stopped falling (several winters back), two feet of it covered everything. I was chatting with the fellow across the street. He looked at the two feet of white above his roof line, then at the sun, and with some anxiety said, "I've got to get up there and shovel that off. Pretty soon, it's gonna start melting, and then it'll be HEAVY."<P>No, I didn't even try to enlighten him about the distinction between weight and density. For two days, I watched from warm, indoor ease as he shoveled snow off his roof.
