For my physics coursework I need to do a 10 minute presentation on why a certain material's physical properties make it suited for a certain application its used for. Eg: Why is steel used to make bridges? Etc...

Anyway, I was going to do about why piezoelectric crystals are used in acoustic pickups but that's WAY too complicated, so I was wondering if anybody else had any suggestions that they would think would make for an interesting presentation? Thanks