Around 1940, Howard Florey and Ernst Chain purified which antibiotic, discovered by Alexander Fleming in 1928?

Before his death in 1920, which journalist helped found America's Communist Labor Party and edited its paper? Before his famous dictionary, who published the 1783 "American Spelling Book", a mainstay of pioneer schooling? Before moving into 10 Downing Street, who won election in 1983 as the MP for Dunfermline East? Which actor played Meryl Streep's troubled son in the 1996 film "Marvin's Room"? Before independence in 1966, Botswana was a British protectorate known by what name? What does "LP", the term for a vinyl album, stand for? Which sitcom starring Lucille Ball and Desi Arnaz began on CBS in 1951 and became a rerun favorite for decades? Long before it named office machines, which job title described people like Johannes Gutenberg?