Taking a Snow Day

Here are some movies of William and Beth sledding down a hill they have created (with a lot of help from a few of their friends, and me).

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These first two movies are from the second day of building. The route came down the hill and turned sharply to the right.
Beth's Happy Dance
William Sledding

The following three movies were taken today, our third day of building. We straightened out the sharp curve and made several softer ones. They can now go much further and faster. I guess maybe we haven't taken a day off school, we are just learning basic principles of physics and engineering.
William Sledding Backwards
Beth Sledding Backwards
William Waving