Multiple discovery

Multiple discovery refers to when two or more people, living in different places and working separately, discover the same thing at the same time. Usually, when one person makes a discovery, like a new invention or a scientific finding, it is the only one – only one person knows it. But sometimes, two or more people discover the same thing without knowing it, which we call multiple discovery. A good example is the invention of the telephone. The invention was made by two different people at the same time, Alexander Graham Bell, and Elisha Gray. They both had the same idea of using electricity to transmit sound, but neither of them knew that the other was working on the same project. So they both invented the same thing without knowing it!