The Almanac of Absurdities for August 10, 2010: This is the birthday of British Physicist Henry Cavendish, born in 1731. This early physicist, emblematic of the age of reason, discovered Hydrogen. Good thing, too, because since then we've discovered there's lots of it out there. Also the birthday of David Lee Roth, and the first day of Elvis Week. On this day in 1889 A patent was issued for the first Screw Cap.