EVB2941993: Teens dancing on Dick Clark's American Bandstand in 1961. Some are dancing the Twist, recently popularized by Chubby Checker's 1960 single, 'The Twist' / Bridgeman Images

EVB2942016: May Day in Beijing. A dance performance in Tiananmen Square, Beijing, China. May 1, 1963 / Bridgeman Images

EVB2942019: Attorney General Robert Kennedy surrounded by African American children. He was visiting a summer reading program in Harlem at the Morningside Community Center, in Manhattan. Aug. 14, 1963 / Bridgeman Images

EVB2942030: President John Kennedy, addressing a joint session of Congress. He announced his ambitious goal of sending Americans to the Moon before the end of the decade. May 25, 1961 / Bridgeman Images

EVB2942039: Jack Nicklaus hitting golf ball out of sand trap in 1965 / Bridgeman Images

EVB2942041: President Kennedy pointing to a reporter during a Press conference. 1961-1963 / Bridgeman Images

EVB2942042: Enzo Ferrari (left), founder and owner of the Ferrari Auto factories Modena, Italy, looks over a 1959 racing car with technicians / Bridgeman Images

EVB2942043: Angel Cordero dressed in racing silks in 1964. He raced for over 25 years, winning over 5,000 races / Bridgeman Images

EVB2942045: 18 year old Billie Jean Moffitt playing tennis at South Orange, New Jersey, in 1962. Moffitt married Lawrence King in 1965, and changed her name Billie Jean King / Bridgeman Images

EVB2942050: Enormous photograph of Walter Mondale. The liberal Minnesota Democrat was the successful Vice Presidential candidate in 1976. July 15, 1976, Unknown photographer, (20th century) / Bridgeman Images

EVB2942054: President-elect John F. Kennedy and North Carolina Governor-elect, Terry Sanford, meet with the press outside Kennedy's Georgetown home. Sanford was a progressive integrationist Southern politician and possible 1964 running mate of JFK. Nov.-Dec. 1960 / Bridgeman Images

EVB2942063: President Kennedy and former President Eisenhower walk ahead of military aides at Camp David. The group met to discuss foreign relations with Cuba after the disastrous Bay of Pigs invasion. April 22, 1961, Unknown photographer, (20th century) / Bridgeman Images

EVB2942075: President John Kennedy and his cabinet. Jan. 1961 / Bridgeman Images

EVB2942085: Jacqueline Kennedy holds a silver pitcher presented by James Hogan Alexander, an old family friend for the White House. Dec. 05, 1962 / Bridgeman Images

EVB2942296: Astronaut John Glenn returned to space 36 years after his historic 1962 flight. He flew into space on the space shuttle at age 77 to study effects of space flight on the elderly. 1998 / Bridgeman Images

EVB2942302: Skylab Orbital Workshop in Earth orbit. The golden shape is a NASA made parasol that replaced heat shield damaged during the unmanned launch on May 14, 1973. One of the solar panels was made inoperable during the same accident. Feb. 8, 1974 / Bridgeman Images

EVB2942303: Skylab 3 Astronaut Allen Bean on the ergometer, breathing into the metabolic analyzer. The experiment obtained information on astronauts' physiological condition in zero gravity. July 28 to Sept. 25, 1973 / Bridgeman Images

EVB2942310: Iranian demonstrators protest against the British government in 1951. They were supporting the Iranian nationalized of the Anglo-Iranian Oil Company in March 1951. in 1953, British and American covert operations replaced nationalist Prime Minister Mohammed Mossadegh, with the more compliant Mohammad Reza Shah Pahlavi / Bridgeman Images

EVB2942316: US Marine in a foxhole in Beirut, Lebanon. The United States intervened to prevent conflict between the Pro-western Maronite Christians and Muslims Arab nationalists. July 1958 / Bridgeman Images

EVB2942328: Hillary Clinton, US Secretary of State, speaking at George Washington University, on August 16, 2011 / Bridgeman Images

EVB2942329: Hillary Clinton visited Daw Aung San Suu Kyi at her house in Rangoon, Myanmar (Burma). December 2, 2011 / Bridgeman Images

EVB2942330: 1949 computer used by rocket scientists at the Lewis Flight Propulsion Laboratory, (now John Glenn Research Center), Cleveland Ohio / Bridgeman Images

EVB2942334: George McGovern, then a Congressman, speaking in 1961 / Bridgeman Images

EVB2942337: Dean Acheson was US Secretary of State during the second term of the Truman administration. c. 1949 / Bridgeman Images

EVB2942369: US Government promoted building and stocking family fallout shelters. President Kennedy recommended all Americans have access to a fallout shelters in an October 1961 speech / Bridgeman Images

EVB2942389: Willa Cather. She achieved recognition for her novels of frontier life on the Great Plains, including 'O Pioneers!', 'My Antonia', and 'The Song of the Lark'. Portrait by Carl Van Vechten, Jan. 22, 1936, Vechten, Carl Van (1880-1964) / Bridgeman Images

EVB2942390: Nuclear engineer is protected from radiation by a fifty-two inch thick, oil-filled glass window as he examines irradiated materials. NASA's Plum Brook Station in Sandusky, Ohio, 1961 / Bridgeman Images

EVB2948291: Austrian Chancellor, Engelbert Dollfuss, lies in state after his assassination on July 7, 1934. He was killed by Austrian Nazi's because of his opposition to union with Hitler's Nazi Germany. He favored the independent, anti-socialist government of his 'Austrofascism' modeled after Italian fascism / Bridgeman Images

EVB2948295: President Barack Obama reviews notes as his staff waits before an event in Denver, Colorado. Oct. 25, 2011 / Bridgeman Images

EVB2948302: Under emblem of the Fatherland Front of Austria, Chancellor Kirt Schuschnigg speaks to parliament. In February 1938, Schuschnigg continued to resist German annexation of Austria, which occurred the following month. Schuschnigg was imprisoned and spent World War 2 in a concentration camp, surviving to teach political science at Saint Louis University from 1948 to 1967 / Bridgeman Images

EVB2948305: President Obama's staff listen as he broadcasts remarks about Supreme Court's ruling on 'Obama Care'. June 28, 2012. From Left: Information and Regulatory Affairs Admin. Cass Sunstein; Asst. Press Sec. Nick Papas; Press Sec. Jay Carney; Social Sec. Jeremy Bernard; Dir. Of Communications, Dan Pfeiffer; Dep. Dir. Of Speechwriting Cody Keenan; Dep. Chief of Staff for Planning Mark Childress; Domestic Policy Council Dir. Cecilia Munoz; Senior Advisor Valerie Jarrett; Dep. Chief of Staff for Policy Nancy Ann Deparle; Chief of Staff Jack Lew; and Health Sec. Kathleen Sebelius / Bridgeman Images

EVB2948319: President Barack Obama prior to announcing military leadership changes, April 21, 2011 / Bridgeman Images

EVB2948320: U.S. Military leaders before meeting with Combatant Commanders and senior military leadership, 2012 / Bridgeman Images

EVB2948323: President Barack and Michelle Obama with Dakota Meyer before Medal of Honor presentation ceremony. Sept. 15, 2011. Marine Sgt. Meyer received the Medal of Honor for his actions on Sept. 8, 2009, while serving in the Kunar Province, Afghanistan / Bridgeman Images

EVB2948325: Former Staff Sergeant Clinton Romesha receives the Medal of Honor at the White House. President Obama applauds at right. At left, Romesha's wife Tammy holds their 2-year-old son, Colin. East Room of the White House, Feb. 11, 2013. He was honored for his actions in the Battle of Kamdesh, 2009, during the war in Afghanistan / Bridgeman Images

EVB2948331: Iranian Foreign Minister Zarif and U.S. representatives in Iranian Nuclear Program Negotiations. Lausanne, Switzerland, March 29, 2015. Left side of table: Jon Finer, Wendy Sherman, John Kerry, Ernest Moniz, Robert Malley. On right are Iranian Foreign Minister Javad Zarif (center), and Dr. Ali Akbar Salehi (on Zarif's right), the Vice President of Iran for Atomic Energy with their advisors / Bridgeman Images