The gentle drone Not all un-manned aircraft are prowling military predators. Drones can also be deployed to chart ice fields and pollution, or locate people who’ve fallen overboard from ships.
A murky glass mystery Discovered by accident, it's useful as a window coating. When the sun shines, this compound gets darker. But why? Scientists have yet to find out.
Mobile taggers Somebody is tagging. Not with spray-paint, mind you, but with microchips. Cell phones are learning to listen, talk and pay at a short distance.