Modern means of communication include the postal system, telephone, fax, computer, newspaper, radio, television, and satellite. The Indian postal system has over 1.5 million post offices. The telephone was invented by Alexander Graham Bell and allows people to talk across long distances. Fax machines scan printed documents and transmit them over telephone lines. Computers can be programmed to solve various problems. Newspapers and magazines provide daily information to mass audiences, while radio and television also communicate news and entertainment via audio and visual broadcasts. Satellites help enable international calls and live broadcasts by transmitting signals from space.