The virus kills nine out of ten of its victims. Its effects are so quick and so gruesome that even biohazard experts are terrified. It is airborne, it is extremely contagious, and...

A highly infectious, deadly virus from the central African rain forest suddenly appears in the suburbs of Washington, D.C. There is no cure. In a few days 90 percent of its...

Hidden away in foggy, uncharted rain forest valleys in Northern California are the largest and tallest organisms the world has ever sustained -- the coast redwood trees, Sequoia...