Underwater cultural heritage refers to all traces of human existence having a cultural, historical or archaeological character, which have been partially or totally under water, periodically or continuously, for at least 100 years.

UNESCO: MEDIA SERVICES

How unusual Dr Marlar discovered when he applied his biochemical assay to the coprolite and found traces of human myoglobin, which were not detected in prehistoric coprolites from other sites or in modern faecal samples.

ECONOMIST: Anthropophagy

"Those episodes proved to be the single most important stimulus for the major transformations in human history, " said Weiss, who digs through the traces of vanished empires for evidence of these climatic events.

CNN: Past may hold clues to climate's future

The search turned up traces of the building, and then something altogether more exciting: A human skeleton, complete with evidence of battle wounds -- a blow to the head, and an arrow in the back -- and scoliosis, or curvature of the spine.

CNN: Richard III: The mystery of the king and the car parking lot

Last year, traces of Aventis's StarLink corn, a genetically engineered variety not approved for human consumption, showed up in taco shells and other foods and this led to a series of expensive recalls.

FORBES: Bayer And Aventis Get Chummy