American physicist, author and screenwriter
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After my two attempts at gently raising the issue of string theory, one afternoon I stepped into Feynman's office to ask him what he really thought.<p>"Can we talk a little about string theory?" I asked. … "Don't you think there are aspects of it that seem very promising?"<p>"Promising? What does it promise? Does it promise to tell you the mass of the proton? No. What does it promise to tell you?"<p>"Well, no one knows how to extract any quantitative predictions yet, but—"<p>"You're wrong. It does make a quantitative prediction. Do you know what that is?"<p>I looked at him. My mind was a blank.<p>"It requires that we live in ten dimensions. Is it reasonable to have a theory that requires ten dimensions? No. Do we see those dimensions? No. So it rolls them up into tiny balls or cylinders too small to detect. So the only prediction it makes is one that has to be explained away because it doesn't fit with observation."
We afford automatic respect to superstar business moguls, politicians, and actors and to anyone flying around in a private jet, as if their accomplishments must reflect unique qualities not shared by those forced to eat commercial airline food. And we place too much confidence in the overly precise predictions of people - political pundits, financial experts, business consultants - who claim a track record demonstrating expertise.
It might seem daunting to think that effort and chance, as much as innate talent, are what counts. But I find it encouraging because, while our genetic makeup is out of our control, our degree of effort is up to us. And the effects of chance, too, can be controlled to the extent that by committing ourselves to repeated attempts, we can increase our odds of success.
Historians whose profession is to study the past, are as wary as scientists of the idea that events unfold in a manner that can be predicted. In fact, in a study of history the illusion of inevitability has serious consequences that it is one of the few things that both conservative and socialist historians can agree on.
The fact that human intuition is ill suited to situations involving uncertainty was known as early as the 1930's, when researchers noted that people could neither make up a sequence of numbers that passed mathematical tests for randomness nor recognize reliably whether a given string was randomly generated.