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'Star Wars' lightsaber thumb-wrestling is a thing. Yep, the ancient sport of thumb war gets a sci-fi upgrade with a lightsaber kit that outfits your thumbs for battle.

Whenever you send a text message, upload a photo, or check your news feed, your phone or computer directs a small amount of power to its radio, and uses that power to beam out a signal. Finding power usually isn’t a huge issue, but if no direct power source were necessary at all, it would be possible to develop simple, battery-free devices that could talk to each other for purposes such as making payments, sending messages, and even monitoring the structure of buildings. Researchers from the University of Washington have put forth just such a possibility: they’ve proposed a new technology called “ambient backscatter” that would require no battery and could wirelessly transmit simple messages. 

Some more Guild Wars 2 Dragons concepts