<iframe title = "Invisible Solar Cells That Could Power Skyscrapers" width="700" height="400" src="https://www.youtube.com/embed/IZ__PjmC6Fg?autoplay=1&modestbranding=1" frameborder="0" allowfullscreen></iframe> <br>Silicon Valley startup Ubiquitous Energy is making the world's first transparent solar cells, a technology that could greatly expand the reach of solar power.