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The high concentration of sedimentary mercury reinforces the rising dinosaur hypothesis that dominates the Earth after a series of volcanic events erupted 200 million years ago.

What will you think of first when it comes to copper? It is a metal of ancient civilizations, once popular for making tools, jewelry weapons and coinage.

The world's largest vaccine manufacturer, Sanofi-Pasteur, has signed a contract with the University of California (USA) to develop a vaccine for acne.