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.
Food- human life can't exist without it. It's a city's most important source of energy. In New York alone, 8 million people consume 10,000 tonnes of food every day. Without new supplies, cities will run out of fresh food in a matter of days.