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 so much better - ever so much slightly better - at error correcting than at error making, then we'll make it.
Jonas SalkReply when questioned on the safety of the polio vaccine he developed: It is safe, and you can't get safer than safe.
Jonas SalkI couldn't possibly have become a member of this Institute, you know, if I hadn't organized it myself.
Jonas Salk