Now this is rather cool.
Ancient Greek and Roman historians recorded that during the siege of Syracuse in 212 BC, Archimedes (a notably smart person) constructed a burning glass to set the Roman warships, anchored within bow and arrow range, afire.
A TV program called MythBuster apparently tried to do this and decided that it was impossible and therefore a myth.
How ever a group of engineers decided to have a go any way and the results are definitely rather cool!
2.009 Product Engineering Processes: Archimedes