The seattle libraries offer free summer programs. This was the first year we hit one meant for “older” kids. The girls were teamed up with another girl and each team needed to design and build a catapult out of pencils, rubber bands, cups, rulers and string. I think the three had fun building it.
After the design and building was finished, they were able to test out their design by launching a ping pong ball. Their team name was “Soup”. Soup tested and modified their design a few times and were able to launch it further each time. Pretty cool.