B. Smith

In the kitchen, when two broths are mixed in one pot, the resulting flavor is new, unlike either of the originals. A similar trick is possible with sound: two waves meeting on the surface of a crystal give birth to a third, with a frequency that neither of them had.

Inside a future fusion reactor, a magnet weighing as much as a small car will float. It holds the superheated plasma like an invisible hand holding a cloud. Previously, such a magnet was considered unsuitable for deuterium-tritium fuel: neutron fluxes would quickly destroy it.