Desktop Linux is widely used in physics and mathematics. NASA uses Linux extensively, including on Mars and on the ISS. SpaceX uses Linux on their rockets and spacecraft. Over 90% of the top 1 million Web servers run Linux, including Yahoo, X, and Ebay. Almost all supercomputers use Linux. Linux has a large and growing share of the automotive market. Your router almost certainly runs Linux. -- John Hasler john@sugarbit.com Elmwood, WI USA