Archaeology is fundamentally the study of humanity and its past. Archaeologists study things that were created, used or changed by humans. They do this by studying the material remains, in other words, the stuff we leave behind.
England's Salisbury Plain is famous as the home of Stonehenge and other enigmatic ancient sites. But it has just yielded a much more recent archaeological wonder: a network of World War I tunnels.
The discovery of ice age mammal bones — one belonging to an extinct camel and the other to either a mastodon or a mammoth (it's hard to say which) — temporarily stopped construction of Los Angeles' subway line extension last month.