September 2, 1969: First time two computers communicated with each other.
Oct 29, 1969: Message sent from computer to computer in different locations.
1971: The first email was sent.
Jan 1, 1983: ARPANET adopted the standard TCP/IP protocol.
March 1989: Tim Berners-Lee invented the World Wide Web.
April 22, 1993: Mosaic became the first web browser.
Which date should we designate as the birthday of the internet? http://www.telegraph.co.uk/technology/6125925/Internet-celebrates-40th-birthday-but-what-date-should-we-be-marking.html -via Buzzfeed
(image credit: Flickr user lemonfridge)