Are you up for a science challenge?
The challenge is to build a "boat" that will travel on its own, via some propulsion method, from end to end in a bathtub filled with water without being touched by human hands. Measure the length of the tub and record how long it takes in seconds. Electrical motors and/or batteries are not allowed for this challenge, as water and electricity are a dangerous mix.
We came up with four different methods that worked. Let us know what you come up with and what was your best time. We'll share results next week.
For instructions on how to make some simple boats, see the bottom of the pumpkin floating post.
Edit: Results of challenge 1