Scientists have been searching for more efficient ways to power electric light bulbs ever since Thomas Edison invented them.
Try providing proof that a space rocket might go through space without using any fuel, seemingly defying the rules of physics in the process, if you're a NASA researcher looking to incite an online uproar.
Hearing aids once may have appeared to many people to be bulky, cumbersome devices that were uncomfortable to wear and announced to the world that you had hearing loss.
The Iron Dome missile defense system, which was unveiled by Israel in 2011, was state-of-the-art technology at the time. It effectively plucked incoming short-range rockets from the air before they could cause any harm to their intended targets.
Physicists still don't know what dark matter is made of, over a century after it was initially hypothesized to explain the motion of galaxy clusters.