Do these genes make me look old?

THE OLDEST evidence of dogs in North America comes from the northernmost outposts, where Inuit sled dogs can be traced back to animals who lived there more than 10,000 years ago. The genetics of the animals suggests that they originated in Asia, and are thought to have followed people across the landmass that once covered the Bering Strait. These dogs show no European heritage in their genetic makeup, making them rare among American dogs.

* Petting zoos are popular, especially during the season for fairs around the country that feature livestock among the attractions. But many parents are unaware of the risks of deadly strains of bacteria that may be present. The U.S. Centers for Disease Control cautions that children should be supervised to ensure that they don't put their fingers in their mouths while petting animals or coming into contact with bedding or fecal material, and that everyone washes his or her hands thoroughly with soap and water on leaving such exhibits.

- Dr. Marty Becker and Gina Spadafori