Images

John Quincy Adams, a copy by Southworth & Hawes of a lost original daguerreotype by Philip Haas, c. 1843. Metropolitan Museum of Art, New York.

John Quincy Adams as he looked at the age of 29, oil on canvas portrait by John Singleton Copley, 1796. Museum of Fine Arts, Boston.

A 1951 photograph of Thor Herydahl (1914-2002), leader of the 1947 Kon-Tiki expedition when he and five others crossed the Pacific Ocean from Peru to Polynesia on a balsa-wood raft. Library of Congress.

A still from the award-winning documentary film made by Thor Herydahl (1914-2002) of his 1947 Kon-Tiki expedition when he and five others crossed the Pacific Ocean from Peru to Polynesia on a balsa-wood raft.

A side view of the Kon-Tiki expedition raft which Thor Heyerdahl (1914-2002) and his crew used to cross the Pacific Ocean from Peru to Polynesia in 1947. The raft was made from traditional materials like balsa-wood logs, bamboo, and coconut...

A front view of the Kon-Tiki expedition raft which Thor Heyerdahl (1914-2002) and his crew used to cross the Pacific Ocean from Peru to Polynesia in 1947. The mask on the sale is a representation of the Sun god Kon-Tiki painted by expedition...

A 1947 photograph of the Kon-Tiki expedition raft taken from an attached dinghy as the raft crosses the Pacific Ocean on its way from Peru to Polynesia.

Vaccines are biological interventions that train the immune system to recognize and neutralize pathogens, preventing disease without causing illness. Since the late 18th century, vaccination has become one of the most transformative developments...

A coyote communicates with other animals at Rocky Mountain Arsenal National Wildlife Refuge by howling. Photograph by USFWS (US Fish and Wildlife Service), 2011.

Quanah Parker, prominent chief of the Comanche Indians with a feather fan. National Archives and Records Administration, Washington, D.C.