A&E Television
History.com: 5 Iron Age Tools and Innovations
New techniques helped make iron stronger -- but there were also innovations in the use of gold, silver and stone. "The earliest iron objects in the world...start showing up around 3000 B.C.," says Nathaniel Erb-Satullo, a lecturer in...
University of Calgary
University of Calgary: Latin America & the Conquistadors
Information about the way the Spanish conquistadors were able to conquer the indigenous people they met.