Free radicals are parts of a chemical structure that are unpaired and therefore super reactive. The reason they are linked to cancer is they can easily form bon

Free radicals are parts of a chemical structure that are unpaired and therefore super reactive. The reason they are linked to cancer is they can easily form bonds with molecules that they shouldn't be bonding with and cause crazy things to happen. See http://en.wikipedia.org/wiki/Radical_(chemistry) http://en.wikipedia.org/wiki/Radical_(chemistry) for more detail