Left: A bartender at Hops & Barley brew pub pours a pint of beer in Berlin, Germany. Right: A portrait of Martin Luther. The protest that Luther launched 500 years ago not only revamped how Europe worshiped, but also how it drank. He and his followers promoted hops in beer as an act of rebellion against the Catholic Church. left: Adam Berry Right: Ullstein bild via/Getty Images hide caption
White House Chief of Staff John Kelly listens as President Trump speaks at the White House on Oct. 19. Kevin Dietsch/Pool/Getty Images hide caption
On October 30, 1935, a Boeing plane known as the "flying fortress" crashed during a military demonstration in Ohio — shocking the aviation industry and prompting questions about the future of flight. National Archives hide caption
Civil rights leader Rev. Martin Luther King Jr. and his wife Coretta Scott King lead a black voting rights march from Selma, Ala., to the state capital in Montgomery in 1965. William Lovelace/Getty Images hide caption
In the last 13 years of Queen Victoria's life, she spent a great deal of time with Abdul Karim, who came from India initially to wait on the queen's table, but soon became part of her inner circle. And despite all opposition, Victoria and Karim curried on. Alexander Bassano/Spencer Arnold/Getty Images hide caption
The man who started it all: German theologian and religious reformer Martin Luther (1483-1546) Imagno/Getty Images hide caption
Lee Harvey Oswald is shown on Nov. 22, 1963, after being arrested for the murder of President John F. Kennedy. Stringer/AFP/Getty Images hide caption
Phillips Collection curator Eliza Rathbone says Renoir was "at the height of his powers" when in he painted Luncheon of the Boating Party. The Phillips Collection, Washington, D.C. hide caption
The owner of a Jerusalem auction house holds up a note on happiness written by Albert Einstein in 1922. The note, which Einstein gave to a courier in lieu of a tip, sold for $1.56 million on Tuesday to an anonymous buyer. Menahem Kahana/AFP/Getty Images hide caption
Members of the San Francisco 49ers kneel during the national anthem prior to a game against the Arizona Cardinals at University of Phoenix Stadium on Oct. 1. Matt Kartozian/USA Today Sports/Reuters hide caption
A scans of the astrolabe reveal not only the emblems on its face (left) but also the degree markings (right) that would have aided sailors in navigation. University of Warwick hide caption
A runner passes a ghostly sculpture on display between Bondi Beach and Tamarama Beach in Sydney. Peter Parks/AFP/Getty Images hide caption
A trader at the New York Stock Exchange reacts on Oct. 19, 1987, when the Dow Jones industrial average plunged more than 22 percent — the biggest single-day drop in history. Maria Bastone/AFP/Getty Images hide caption