When the US and the USSR were busy flexing at each other by blowing up bombs on testing fields, they were spraying the atmosphere with radioactive carbon. (What could be more obnoxiously macho, right?)
That carbon is being eaten up by the ocean at a certain rate, and it can let us know how old certain growing organic structures are.
Like teeth…or tusks.
Listen in to learn about some interesting new technology that could help us find elephant poachers (before they kill off all our elephants in twenty years or so):