Ocular, the lens also known as the eyepiece in a refracting telescope and in a microscope.
Iran has announced its activation of a second set of uranium centrifuges. These machines are at the core of the uranium-enrichment process. Find out where the centrifuge fits into the equation.
Did you know the sun is highly magnetic? Or that you can create a power propulsion system using magnets? Learn all about magnetism in these videos.