We must always refill and ensure there is a critical mass of leaders and activists committed to nonviolence and racial and economic justice who will keep seeding and building transforming movements.

It was clear to me as a civil rights leader in the '60s that unless we put the social and economic underpinnings beneath the political and the civil rights, we wouldn't go anywhere.

When President Kennedy was elected, many black Americans, like so many Americans, were captivated by his youth and energy and promise and were especially hopeful that he might move the country in a new direction on civil rights.

It was very clear to me in 1965, in Mississippi, that, as a lawyer, I could get people into schools, desegregate the schools, but if they were kicked off the plantations - and if they didn't have food, didn't have jobs, didn't have health care, didn't have the means to exercise those civil rights, we were not going to have success.

I don't like to give advice. I like to give people information because everyone's life is different, and everyone's journey is different.

I started when I was 39 as a cabinet secretary, and so I feel like I have lived an experience in my life where I can relate to families that struggle, and are scraping by and scrounging.

I even remember the first contract I ever signed. I was 13 or 14... my dad said, 'It's your choice. It's your life.'

The existence of symmetry laws is in full accordance with our daily experience. The simplest of these symmetries, the isotropy and homogeneity of space, are concepts that date back to the early history of human thought.