In the near future, when you need to charge your smartphone, you could just let it soak up a few solar rays. That's because your screen could be a solar-powered transparent battery.
Researchers at Japan's Kogakuin University developed a prototype of a lithium-ion battery that charges itself in sunlight. It's only about 80 to 90 nanometers thick, so you could see your smartphone's screen through it.
The researchers behind the new power-generating battery hope to use it to create smart windows for buildings. These would both create and store energy. Check out the prototype, courtesy of Kogakuin University:
This is a technological breakthrough we can get behind. Keep checking back to our Happening Now page for all the latest news from the digital world, and we'll let you know when these solar-powered batteries are on the market.