When things get bad enough, then something happens to correct the course. And it’s for that reason that I speak about evolution as an error-making and an error-correcting process. And if we can be ever...

Reply when questioned on the safety of the polio vaccine he developed:It is safe, and you can’t get safer than safe.

Some people are constructive, if you like. Others are destructive. It’s this diversity in humankind that results in some making positive contributions and some negative contributions. It’s necessary to have enough to make positive contributions...

Are we being good ancestors?

There is hope in dreams, imagination, and in the courage of those who wish to make those dreams a reality.

Hope lies in dreams, in imagination and in the courage of those who dare to make dreams into reality.

I look upon ourselves as partners in all of this, and that each of us contributes and does what he can do best. And so I see not a top rung and a bottom rung...