Last week we designed and made our own pirate ships for homework. They were fantastic! We also looked at which materials would be good at floating and sinking for our pirate ships. We tested: metal, clay, paper, felt, wood and plastic. We were surprised that some of our guesses were not right. We found out that some materials floated and sank depending on their shape and surface area. We talked about how to keep the experiment fair and why different materials floated and sank.