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Wednesday, September 18, 2002Antimatter success: cold anti-hydrogen made in the labAfter years of effort, anti-hydrogen atoms, made of an antiproton and a positron instead of a proton and electron, have been made and detected in an experiment in Geneva. Over 50,000 anti-atoms have been made and are enough to do extremely sensitive tests of fundamental aspects of physics. They provide a starting point for exploring new aspects of anti-matter. The results are published online at Nature today.
Counting sheepScientifically counting sheep sounds like a topic that would put most people to sleep. But Michael Vaughan of Virginia Tech doesn't get much sleep while he spends four weeks of each year rafting down the Colorado River to study the Grand Canyon bighorn population. Vaughan counts the lamb-to-ewe ratio in April and then goes back three to six months later to do a recount. The change in ratios reflects the sheeps' survival rates, critical information for wildlife managers. The appeal of the field work is enough to attract plenty of graduate students and up to 20 other scientists join the excursion for their own studies. Those other researchers were doing a Mexican Spotted Owl search, mule/deer pellet surveys, and frog and lizard surveys.
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