A new type of nanometer-size semiconductor crystal that can amplify light marks an important step toward cheap, tunable lasers.
New technologies for treating depression could make the couch obsolete.
Superconducting cables could make power-grid infrastructure more secure.
A new way to make hydrogen from corn or potatoes could make fuel-cell vehicles more practical.
New music software could make online jams nearly as good as rehearsals in the same studio.