Business • Money • Growth on Instagram: "In the early 1970s, computer engineer Raymond “Ray” Tomlinson was working on ARPANET — the network that would eventually evolve into the internet — when he solved a challenge no one else had addressed: sending messages between different computers. Before his breakthrough, people could only leave notes on the same machine. Tomlinson modified a program called SNDMSG to transmit messages across the network, and in 1971 he sent the very first network email. W