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Obama’s three-nation tour of Africa

Obama visits Senegal, stands at the "Door of No Return, " at the slave house on Goree Island off Dakar. He called his trip a "very powerful moment." The Washington Post

This conservative group is tired of being accused of climate denial — and is fighting back

This conservative group is tired of being accused of climate denial — and is fighting back - The Washington Post

34 American Lady Scientists Who Changed The World

Roger Arliner Young (1889–1964) was a zoologist and biologist and the first African-American woman to receive a doctorate in zoology. During her long career she studied radiation, paramecium, and hydration and dehydration of living cells. | 34 American Lady Scientists Who Changed The World

Michael Beschloss on

Jack Johnson Jack Johnson...the best heavyweight of his generation. He was the first black Heavyweight Champion of the World (1908-1915).

Girls deliver ice. Heavy work that formerly belonged to men only is being done by girls. The ice girls are delivering ice on a route and their work requires brawn as well as the partriotic ambition to help. 09/16/1918 From the Records of the War Department; American Unofficial Collection of World War I Photographs, 1917 - 1918

President Barack Obama walks on the South Lawn of the White House in Washington, D.C., on April 15, 2015. (Photo by Manuel Balce Ceneta/AP)

A Pugnacious Obama Takes on (Most of) the World

Obama names and shames Russia; buries the myth of Middle East 'linkage'; and promises to lead the fight against barbarism, in a temperamentally different sort of speech.

March on Washington anniversary to bring together three US presidents