Jonas Salk: I just plowed on. Hurt? That’s one thing. Being deterred is another thing. And so, while we prefer to have an open path, one thing you learn in life is that there is no such thing as a free lunch. There’s no way that everyone is going to agree and particularly if you go against the main stream. Everyone at that time had their minds set on how they thought the problem ought to be dealt with, whether it was influenza or poliomyelitis or now even the work on AIDS. That’s a characteristic of what I like to call the “evolutionary process.”