A chemist friend once told me: Cancer/dna-mutations happen all the time. They're triggered by the energy from cosmic rays, free radicals etc. A lot of those r

A chemist friend once told me: Cancer/dna-mutations happen all the time. They're triggered by the energy from cosmic rays, free radicals etc. A lot of those reactions involve the oxygen we inhale, so one of the reasons for cancer and death is actually that we're slowly being burned in our hazardous atmosphere.