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The order of these genes on the sex chromosomes of cats more closely resembles that of humans than of any other mammal studied so far, the team reports in a recent issue of Genome Research. Genes on X chromosomes of cats and people are lined up in the same way.

Every two years as the Olympic Games begin, we hear about athletes using or at least being tested for performance-enhancing drugs. Every time the Tour de France rolls around, there's talk of possible doping. Sometimes, competitors raise the question when one athlete does particularly well. Other times, tests catch athletes with drugs in their systems. The practice of using artificial substances or methods to enhance athletic performance is called doping. Doping has become such a great concern that the United States formed an Anti-Doping Agency.

Why Some Athletes Use DrugsAthletes face enormous pressure to excel in competition. They also know that winning can reap them more than a gold medal. A star athlete can earn a lot of money and a lot of fame, and athletes only have a short time to do their best work. Athletes know that training is the best path to victory, but they also get the message that some drugs and other practices can boost their efforts and give them a shortcut, even as they risk their health and their athletic careers.

As far back as ancient Greece, athletes have often been willing to take any preparation that would improve their performance. But it appears that drug use increased in the 1960s. One well-publicized incident happened at the Seoul Olympics in 1988 when sprinter Ben Johnson tested positive for anabolic steroids and was stripped of his gold medal. Athletes may also misuse drugs to relax, cope with stress or boost their own confidence. Athletes may have several reasons for using performance-enhancing drugs. An athlete may want to: Build mass and strength of muscles and/or bones Increase delivery of oxygen to exercising tissues Mask pain Stimulate the body Relax Reduce weight Hide use of other drugs

ince the Centers for Disease Control (CDC) in Atlanta issued its first warning about HIV/AIDS in 1981, more than 25 million people around the world have died from the disease.

with more than 4 million new infections in 2006 and almost 3 million deaths.

estimated 40 million people are living with HIV/AIDS worldwid

"jimmie hat"

company that produces the condoms says it's promoting safe sex

physical attributes generate in fans (particularly those of the opposite sex) have contributed to the group's popularity in ways that cannot be overstated

only living member of the family Phascolarctidae, in the order Diprodontia, class Mammalia.

eastern Australia

skull is flattened on the sides