1970: ARPANET expands

By the end of 1970, ARPANET had grown to 13 nodes, including East Coast schools like Harvard and MIT. Among the early nodes was Bolt, Beranek, and Newman (BBN), an engineering consulting company that did the engineering work required to build ARPANET. Each ARPANET site had a router known as an Interface Message Processor. These cost $82,200, or half a million dollars in today's money.