The topic for the day is the ultraphone ear-disc. You may know it better as
Some of the other things that Armageddon 2419 introduced (there are more):
1. remotely piloted drones (more radio)
Armageddon was adapted into the Buck Rogers comic strip just a year later, and it mostly delves into space exploration after that, but that initial novella was quite visionary.
Bonus U (breaking news)
One of the shows I loved growing up, and, when I say loved, I mean loved, as in it was not negotiable as to whether or not I was going to get to watch it or not, and my family knew it, was Doctor Who. Other than the TARDIS, the Doctor had two things that were really cool: K-9 and his sonic screwdriver. The sonic screwdriver is kind of what it sounds like. Okay, well, it's not a screwdriver at all, at least, not in appearance, but it does use sound as a sort of a screwdriver, and, other than a lightsaber, it's one of the things I grew up wanting to have.
the latest Doctor with his screwdriver
There has been ongoing research into sound over the years, specifically ultrasound. That is, after all, how we got the ultrasound machine. There are even ultrasound techniques for non-invasive surgery. Yes, they don't have to cut you open, just use a beam of sound to take care of what ails you. The new development, though, is that some physicists at the University of Dundee got together and developed a way to lift and manipulate objects with sound alone. It's a pretty amazing achievement that could lead all sorts of places. One problem: I don't think it's something anyone's going to be carrying around in their pocket anytime soon.