We need to stop refighting 40-year old battles on women's rights.

As we celebrate Labor Day, we honor the men and women who fought tirelessly for workers' rights, which are so critical to our strong and successful labor force.

We have a lot of work we need to do to make sure all of our children have a better understanding of this diverse and wonderful and beautiful world.

We need a comprehensive strategy that includes expanding criminal background checks for all commercial gun sales, dedicated federal law to combat gun trafficking, and a strong commitment to mental health services.

If you're not having a good time, find something else that gives you some joy in life.

Ultimately, my Ph.D. is in mathematical physics, focusing on quantum field theory and curved space-time, and I worked with Stephen Hawking.

My whole interest is, how do you use evolution as an innovation engine? How does evolution solve new problems that life faces? And to have a system that can create a whole new chemical bond that biology hasn't done before, to me, demonstrates the power of nature to innovate.

I've always found that the poorer the places that I go, the more smiles I see, and the more happiness I see.