Solution to Challenge 3

Steps
1. Fold the boat as in the chapter on one A4 sheet.
2. Cut or fold a quarter of an A4 sheet (about 105 x 148 mm), keep the same proportions as far as possible, and fold the same boat.
3. Float both.

Checkpoints
- Both boats should float for a while. Paper soaks up water and eventually sinks.
- The larger boat usually floats longer and stays upright better because it sits higher and has more sail and hull area relative to a splash of water.
- A creased edge that is sharp keeps water out a little longer than a loose fold.
- Two sentence answer example: The bigger boat floated longer because it has more paper to soak up before it sinks and sits higher. The small one took on water faster because a small splash is a large share of its size.