Invisibility Cloaks: What would it take to be invisible? Everyone from Harry Potter, Jean-Luc Picard, and the United States Army, to desperate test takers and people on awkward dates all over the w...

Improving Solar CellsHow do we catch photons, and lots of them? That's one of the big problems to solve when building a solar cell. Photovoltaic cells absorbs the energy of light, creating an elect...

To Reflect or Refract: Which Telescope is Better? We want to buy a telescope. If not today, then some day. There are two types of telescopes: refractor and reflector telescopes. Before learning abo...