The world's cities are growing at a faster rate than ever before. An estimated 75 million people around the world move to an urban area every year. And as our metropolises become more and more crowded, architects, designers, and builders face a constant challenge.
Learn how robots were first conceptualized in ancient Rome and see how their use has evolved over the centuries, from the calculator to the Roomba. Then, take a sneak peek at what future robots will be able to do. Narrated by Patrick Stewart.
For most of human history, our neighboring planets were little more than dots of light in the sky with comets and asteroids being a complete mystery. Today the smaller rocky planets and asteroids are seen as the key to understanding the formation of our planetary system.