Hundreds of small earthquakes at Yellowstone National Park in recent weeks have been an unsettling reminder for some people that underneath the park's famous geysers and majestic scenery lurks one of the world's biggest volcanoes.

VIDEO. An unprecendented look at the development of twins in utero.

Scientists working towards pancreatic cell transplants as a cure for diabetes have taken the first step to getting around the problem of immune rejection. Transplanted genetically engineered cells in mice lasted a few months before being rejected.

Suspect faces murder charges in death of 2 1/2-year-old boy

Warmer temperatures and earlier melting of sea ice are causing polar bears to go hungry. The number of undernourished bears has tripled in a 20-year period.

Meredith Emerson adopted her dog, Ella, from a rescue organization. Emerson, a Longmont native, disappeared Jan. 1, 2008, during a hike in Georgia. Emerson was killed Jan. 4, 2008.

Drug Enforcement Administration officials investigating a Mexican drug trafficking ring called the Gulf Cartel found more than they bargained for: a massive cockfighting enterprise that may be the largest ever discovered in the United States.

A woman who wanted to give her granddaughter a puppy for Christmas but ended up with a dead dog is accusing a Los Lunas breeder of running a puppy mill.

Sky helps prevent bird strikes, which can cause major damage to an aircraft. Birds can get sucked into an engine or hit a windshield with enough force to cause a pilot to lose control.