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Ship Building: Belfast
Some of the world's most famous ocean-going vessels, including the RMS Titanic and both of its sister vessels, Olympic and Britannic, were built at the shipyards in Belfast, in Northern Ireland.
Among the most prolific of shipbuilders during the Gilded Age was Harland & Wolff, which is still in business today, but now focuses much of its efforts on offshore renewable energy. In addition to the Olympic class vessels, the modern ocean liners Southern Cross and Canberra, the company built a number of the UK's aircraft carriers and cruisers.
Seismology: Robert Mallet
We often think of Silicon Valley as the cradle of American technological innovation. Intel, Apple, Oracle, Cisco, Hewlett Packard — just to name a few, are all headquartered there.
But Silicon Valley, as well as the entire San Francisco Bay Area and many parts of the world that are susceptible to siesmic activity, would have no understanding of earthquakes and how to anticipate and record their activity, and the entire science of earthquake-proofing buildings and other structures would not have come to fruition, if it were not for the development of Instrumental Seismology in the 1840s, which was invented by Robert Mallet, an Irishman.
Time Machines: DeLorean Motor Company
Ok, maybe the DeLorean DMC-12 can't really travel through time, but the iconic vehicle that became famous in the Back to the Future trilogy was originally made and manufactured at a facility in Dunmurry, a suburb of Belfast, Northern Ireland.
For a brief period from 1981 to 1982, approximately 9,000 DMC-12 cars were built before the company had massive financial issues and had to cease operations.
Today, there is a new DeLorean Motor Company based in Texas which supplies parts to the owners of over 6,500 DMC-12 cars still in operation, and plans to resume production on an updated car using a combination of surplus parts and new fabrication.