Stem cells have the potential to be used to treat and better understand some of the world's most deadly and disabling diseases.
Mark UdallIt's the uncertainty, the challenge and the willingness to put it all on the line that draws a lot of people to climb mountains. That can also apply to a lot of other challenges in life, whether it's running for office, starting a family, going to grad school or taking all of your cash and assets and starting a business.
Mark UdallPolitical differences will always generate a healthy debate, but over time the dialogue has become more hateful and at times violent.
Mark Udall