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The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

World Data Locator Map: Australia

Is Australia an Island?

Scolex (head) of the tapeworm Taenia solium. The hooks of the scolex enable the tapeworm to attach to the intestinal wall.

Uninvited Guests: The 7 Worst Parasitic Worms

The Castillo, a Toltec-style pyramid, rises 79 feet (24 meters) above the plaza at Chichen Itza in Yucatan state, Mexico. The pyramid was built after invaders conquered the ancient Maya city in the tenth century.

What’s Inside the Pyramid at Chichén Itzá?

Charles Darwin, carbon print photograph by Julia Margaret Cameron, 1868.

What Darwin Got Right (and Wrong) About Evolution

Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

Which Religion Is the Oldest?

Bolshoy Ice Dome during ice hockey Men's Prelim. Sochi 2014 XXII Olympic Winter Games

7 Ways Hosting the Olympics Impacts a City

retrospective searching

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reference librarianship

In library: Retrospective searching
The outcome of a search can take many forms, from a short, factual statement that gives the needed information to a short list of relevant references or a full-scale bibliography. In a computer search the first request often reveals that the database contains…
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