What's the safest place to put a nuclear reactor? Offshore, apparently. A new power plant design concept from MIT envisions a facility built on floating platforms, moored in deep water several miles off the coast. This, the concept's creators explain, lends it several crucial advantages -- making it virtually immune to earthquakes, tsunamis and meltdowns. Big promises, to be sure, but the professors' reasoning actually makes sense: in deep water, tsunami waves aren't large enough to cause significant damage, and earthquakes are usually only felt if you're standing on the earth. Floating the reactor on the ocean also gives the plant access to easy, passive cooling, what MIT's Jacopo Buongiorno calls an "infinite heat sink."