Clarkson is passionate about engineering, especially pioneering work. In "Inventions That Changed the World" Clarkson showcased the invention of the gun, computer, jet engine, telephone and television. He has previously criticised the engineering feats of the 20th century as merely improvements on the truly innovative inventions of the Industrial Revolution. He cites the lack of any source of alternative power for cars, other than by "small explosions". In "Great Britons", as part of a public poll to find the greatest historical Briton, Clarkson was the chief supporter for Isambard Kingdom Brunel, a prominent engineer during the Industrial Revolution credited with numerous innovations. Despite this, he also has a passion for many modern examples of engineering. In "Speed" and "Extreme Machines", Clarkson rides and showcases numerous vehicles and machinery. Clarkson was awarded an honorary degree from Brunel University on 12 September 2003, partly because of his work in popularising engineering, and partly because of his advocacy of Brunel.