Adam Nash was conceived via in vitro fertilization — specifically so doctors at the University of Minnesota could collect stem cells from his umbilical cord blood to save his sister, Molly. Today, back home in Colorado, he has a driver's license and helps disabled children ski.
Workers in Idaho prepared to inflate rolling tubes beneath a massive sequoia that grew over more than a century from a seed sent by naturalist John Muir. Then, they wrestled the tree up a ramp to street level Friday.
In a story June 20, The Associated Press reported that airplanes take off and stay aloft because of lift, the force from the movement of air underneath the plane's wings that push it upward. The story quoted a scientist who explained that heat makes air expand and become less dense, reducing the amount of force the air can exert on the wings. The story should have made clear that lift is created by movement of air both above and underneath the plane's wing. The movement of air above the wing creates an area of low pressure. The movement of air below creates an area of high pressure. That difference pulls the plane up.
Protections that have been in place for more than 40 years for grizzly bears in the Yellowstone National Park area will be lifted this summer after U.S. government officials ruled Thursday that the population is no longer threatened.
Back-to-back fatal maulings of people by black bears in Alaska appear to be flukes by rogue animals, experts said Tuesday. But they warn that people venturing into bear habitat should always carry repellent spray or guns.