Stem cells have the potential to be used to treat and better understand some of the world's most deadly and disabling diseases.

You don't climb mountains without a team, you don't climb mountains without being fit, you don't climb mountains without being prepared and you don't climb mountains without balancing the risks and rewards. And you never climb a mountain on accident - it has to be intentional.

It'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.

I think most Americans would agree people should be treated equally and everyone ought to be able to pursue a fulfilling life with the ones they love.

On the mountains mistakes are fatal. In politics, mistakes are wounding emotionally, but you recover. Personally, wilderness helps me get back in touch with natural rhythms, helps me reflect and, in the process, restore my creativity.

I've learned from being in the woods that titles don't mean much and that actions speak a lot louder than words - even in Congress. I always look for the people who want to act - people who want to run the river or climb the mountain - even if they're not members of my political party.

It's tough to know the value of water until it's gone.