1848: James Marshall discovered a gold nugget at Sutter's Mill in northern CA, which led to the gold rush of '49. 1888: Ernst Heinkel, inventor of the first jet-powered aircraft, was born. 1916: The U.S. Supreme Court ruled that income tax was unconstitutional. 1935: Beer was first sold in cans, by Krueger Brewing Co. 1948: IBM dedicated its "SSEC," the Selective Sequence Electronic Calculator, that handled both data and instructions using electronic circuits made with 13,500 vacuum tubes and 21,000 relays. 1950: The microwave oven was patented by Percy Spencer. 1884: Albert Gilbert, inventor of the Erector Set, died. 1965: Sir Winston Churchill died in London at age 90. 1978: Cosmos 954, a nuclear-powered Soviet satellite plunged through Earth's atmosphere and disintegrated scattering radioactive debris over parts of Canada's Northwest Territory. 1984: Apple Computer released the first model of the Macintosh. 1986: The Voyager 2 space probe swept past Uranus, coming within 50,679 miles of the seventh planet of the solar system. 2003: The United States Department of Homeland Security (DHS) was formally activated.