Michael had long been threatening to buy a ski helmet for me. He had a helmet, we made Eleanor wear a helmet, it would make sense for me to have one too. I resisted: it's more equipment to lug around, it's expensive, it's uncomfortable, it looks dorky, it couldn't be really necessary or more people would have one... On this most recent trip, Michael succeeded in convincing me to buy a black helmet with purple details--very comfortable, soft and fuzzy on the inside, a nice fit. The best things about it, I thought, were that it held my goggles on tight and I didn't have to wear a hat. On my first run of my second day skiing, I went down the easier of the two blue choices (the harder route was very steep, with snow being made and blowing hard right up the hill). There was fresh "snow" on the hill I chose too, a bit thick and slipperier than the groomed parts. I skied carefully down. Suddenly I heard a "Whoa whoa whoa!" and saw a blur behind me a...