Extreme up-close video of tornado near Wray, CO
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In a piece of scientific detective work spanning centuries, researchers have finally discovered the source of a classical nova witnessed by Korean royal astronomers on 11 March 1437. The nova, a giant thermonuclear explosion, lingered as a bright spot between two stars in the constellation Wei?a part of Scorpius?for 14 days before vanishing. Using x-ray, ultraviolet, and photographic images from as far back as 1923, the team traced its source to what is now a dim star in Scorpius, they report today in Nature. The images showed the expanding shell of hydrogen ejected by the explosion. Unlike a supernova, in which stars blow themselves apart with terrifying finality, classical novae are smaller events in which gas from one star in a closely spaced binary system is captured by the other star, accumulating until it erupts in a giant thermonuclear explosion. Classical novae are believed to occur on multithousand-year cycles,
"The potential value of a collection cannot be assessed in the field. Perhaps this statement could best be illustrated by PI 178383, a wheat I collected in a remote part of Eastern Turkey in 1948. It is a miserable looking wheat, tall, thin-stemmed, lodges badly, is susceptible to leaf rust, lacks winter hardiness yet is difficult to vernalize, and has poor baking qualities. Understandably, no one paid any attention to it for some 15 years. Suddenly, stripe rust became serious in the north-western states and PI 178383 turned out to be resistant to four races of stripe rust, 35 races of common bunt, ten races of dwarf bunt and to have good tolerance to flag smut and snow mould. The improved cultivars based on PI 178383 are reducing losses by a matter of some millions of dollars per year."
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