The Air ConditionerWillis Carrier invented the airconditioner in 1902. image:http://images.businessweek.com/ss/06/09/300m_innovations/source/9.htm info:http://inventors.about.com/od/timelines/a/twentieth.htm
Antibiotics/PenicillinAlexander Fleming invented penicillin after he forgot about some germ cultures in one of his experiments.
First Digital ComputerIt is credited to John Vincent Atanasoff and Cliff Berry. Atanasoff was named the official invention on October 19, 1973
Microwave OvenPercy Spencer is inspired by the idea in 1945 but doesn't patent it until 1955. In that year the Tappan Stove Co produces the first home micriwave. info: http://www.popularmechanics.com/technology/gadgets/news/2078467
The First Mobile PhoneMartin Cooper invented the first cell phone that didn't have to be built into a vehicle. info:http://en.wikipedia.org/wiki/History_of_mobile_phones
The InternetThough the internet was in developmental stages from as early as 1958, it became open to the public in 1992. It was not invented by one person, but rather by a few experts over many years.
Text MessagingNeil Papworth sent the first text message which said "Merry Christmans" over the Vodafone nextwork to Richard Jarvis' phone.
info and photo: http://en.wikipedia.org/wiki/Text_messaging
Global Positioning System (GPS)Ivan Getting and the US Department of Defense invented the GPS. They are in everything from cars, to laptops and phones. info: http://gilbertm.hubpages.com/hub/inventions20century
First Portable MP3 Playerimage and info: http://www.reghardware.com/2008/03/10/ft_first_mp3_player/
Korea's Saehan Information Systems invented it
Larry Page and Sergey Brin invented Google as a private company and then it became public on August 19, 2004.
info and photo:http://en.wikipedia.org/wiki/Google