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On August 13, 1415, the 27-year-old English king Henry V led his army into France. Within two months dysentery had killed perhaps a quarter of his men, while a French army four times its size blocked escape to Calais and across the English Channel. Winter approached; food grew scarce

Editor's Note: The following is an excerpt from a chapter in Nathan Wolfe's new book: The Viral Storm: The Dawn of a New Pandemic Age (published October 11 by Times Books, an imprint of Henry Holt and Company, LLC. Copyright

(PhysOrg.com) -- University of Chicago physicists Henry Frisch and Melvyn Shochet became involved with the Tevatron particle accelerator when it was still in the planning stages at Fermi National Accelerator Laboratory in 1976.

After studying video footage and radar images from Saturday's deadly stage collapse at the Indiana State Fair, AccuWeather.com Senior Meteorologist Henry Margusity suspects that a gustnado was a cause of the collapse.