Nowadays, manual labour has largely been replaced by machines; in some cases machines are completely taking over certain processes. For example, some machines produce food and energy, as well as transport passengers and goods by land, sea, air and even space. Others simplify administration, planning or organizational tasks; for instance, computers support office work, education and research. The global connection between humans and machines is made possible by computer networks that allow for the merging of old and new ways of communication. Computers can even be programmed to simulate the intelligent performances of living organisms and transfer this artificial intelligence into motion carried out by robots.