By now we've all heard a S. Korean team has claimed to have created a room temperature and ambient pressure superconductor, which a couple other teams have claimed to have replicated. It's pretty important to a very wide array of technologies, from maglev to rail guns, and not least important, CPUs.
However, PNAS just published a team from MIT that claims to have created a supercapacitor made from cement and lamp black. As significant as ambient temperature and pressure superconductors are, being able to store electrical energy in something as ubiquitous as concrete doped with one of the most common and low tech forms of carbon extant is no less propitious. There isn't a structure in the civilized world that doesn't have a large mass of concrete under it. If that foundation slab can be a ~10kw electrical power storage device, the problem of range and charging electric cars is over because they can just draw power from the roadway. Also, the slight inconvenience of them bursting into flames and exploding when their lithium batteries overheat will go away too.
Every house will come with a powerwall...er, floor. Driveway. Whatever. The exotic carbons like buckyballs, graphene, etc., have some issues. Carbon black is no more hazardous than soot.
The opportunities that become possible with these two developments are astounding.