Political differences will always generate a healthy debate, but over time the dialogue has become more hateful and at times violent.

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.

There is no question that we must do more to secure our borders - but how we go about securing them is also important.

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

I haven't inherited the earth from my parents, I am borrowing it from my children.

We really don't have a policy [on climate change]. There's a lot of rhetoric and not a lot of action.

Ranchers need clean water for their stock, farmers need it for their crops, every employer needs it to stay in business, and every living thing needs it for life... The law needs to be clear to protect water quality and the rights of landowners.