Sherds from a jar of clay

I bet very few of you knew that the Rubber Band was patented on this day in 1845 by Stephen Perry of London. The kids and I talked about them today as part of school and used cardboard boxes and rubber bands to make music. However, I decided it would not be in my best interest to share the info. I found on the physics and technique of shooting rubber bands with my 4 year old son. Maybe when he is older?