The 75.47-carat Hooker Emerald was worn by Ottoman Sultan Abdul Hamid II, the last sultan of the Ottoman Empire. Photo by Chip Clark, courtesy Smithsonian Institution, National Museum of Natural ...

Cardman has this type of portrait, as well. But in this photograph by Valcarcel, Cardman embodies the past and future of human spaceflight, all while reflecting her own experience. Had she not ...

US Secretary of State Hillary Clinton on Thursday hosted a delegation of lawmakers, civil rights activists and some of this country's leading musicians, including jazz great Herbie Hancock, on the ...