A robot is a machine. It is a machine that moves. It follows instructions. The instructions come from a computer. Because it is a machine, it does not make mistakes. It does not get tired. And it never complains. Some robots are used to make things. Robots can help making cars. Some robots are used to explore dangerous places like exploring volcanoes. Some robots are used to clean things. These robots can help to clean your house. Some robots can even recognize words. They can be used to help answer telephone calls. Some robots look like humans. But most robots just look like machines. The first robot was built by George Devol in 1954 and was named Unimate. It was used to make cars. In the future, we will have even more robots that can fight fires, fight wars and fight sickness. They will help to make life better. The word opposite in meaning to the word 'dangerous' is: