4/13/1743 Thomas Jefferson, Scholar, Lawyer, 3rd president, studied 15 hours a day, founded the University of Virginia, wrote the Declaration of Independence, Secretary of State under Washington, first Vice President, He was a friend of Joseph Priestley, studied agriculture, experimented with grains, classified fossils in New York state, he died in 1826 at age 83 on July 4th.
4/13/1771 Richard Trevithick, inventor, built the first steam locomotive, he died in 1833 at 62.
4/13/1857 Sir Ronald Ross, physician, worked on mosquitoes and in1897 discovered the malarial parasite in the Anopheles mosquito; he died in 1932 at age 75.
4/13/1892 Robert Watson-Watt, physicist, discovered Radar, he died in 1973 at age 81.
4/13/ 1905 Bruno Rossi, physicist, He worked with cosmic radiation and found that it would penetrate a yard into solid lead. He discovered the solar wind and X-ray stars; he died in 1993 at age 88.