There are toy lightsabers, and then Styropyro’s version, which uses a massive Nichia GaN blue laser diode. It was over-driven to 7W output by running it at 4.6A with a couple high efficiency buck drivers in parallel. An anti-reflective coated glass lens focuses the beam, making it all come together, while the device is powered by two unprotected 18650 batteries in series. “In terms of building a working lightsaber, the two main limiting factors are beam confinement and high energy density storage. With the amazing Li-Ion batteries that the scientists/engineers have developed, stupidly powerful handheld lasers can be built, just like this one here. The issue then becomes confinement, which doesn’t look possible any time soon with a device like this. Oh well, my attempt is still bright and light things on fire,” said Styropyro. Click here to view the first image in today’s viral picture gallery. Continue reading for the five most popular viral videos today, including one of a nifty life hack showing how to defog your windows twice as fast using science.