A computer is a device that can be programmed to process data. Computers range in size and capability - from small, cubic millimeter small mini-computer to large, room-sized supercomputer.
The first programmable calculating machine the Z3 was designed by German engineer Konrad Zuse in 1941. The Z3 weighed about a ton. After the development of the microprocessor in the 1970s, size and cost of computers shrank. In 1981 IBM introduced the first personal computer (PC). Since then, the term "computer" usually refers to a portable folding computer (notebook) or box-shaped desktop computer.
Modern batteries are already providing enough energy to get airborne. Something start-ups like Volocopter are taking advantage of - creating light-weight computer-piloted arial vehicles they hope will soon replace your trusty taxi, AND help cut down congestion in the world's urban centers.
For computer scientist Hany Farid, developing image analysis tools that can stop illegal content online is not enough. He says we all need to take responsibility, not least the companies that lobby and lie hard.