I think the wall is stupid; it's a waste of the taxpayer's money. We need the money for job growth, infrastructure, 100 other things... it sends a bad message.

Discriminatory wage practices undermine women's ability to provide for their families and survive on a decent retirement income.

I have always stood up to protect women's access to safe and legal abortion, birth control and health care at Planned Parenthood.

I didn't know how to pass a major piece of legislation; I didn't know how to get colleagues to support my views. It took a lot of asking for advice and learning. One of the lessons is that you have to be able to tell people why you care, and you're only going to be able to do that if you talk to someone whom an issue is affecting.

The possibility of a scientific treatment of history means a wider experience, a greater maturity of practical reason, and finally a fuller realization of certain basic ideas regarding the nature of life and time.

We must learn to set our emotions aside and embrace what science tells us. GMOs and nuclear power are two of the most effective and most important green technologies we have. If - after looking at the data - you aren't in favour of using them responsibly, you aren't an environmentalist.

It has pleased no less than surprised me that of the many studies whereby I have sought to extend the field of general chemistry, the highest scientific distinction that there is today has been awarded for those on catalysis.

I studied what the Germans call the Naturwissenschaften, the natural sciences. Everything from biology to geology. How the clouds are formed, how the animals live, and what makes the rocks. So I know about nature. Period.