Francis Crick Quotes
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Intelligent thinking means an increment of freedom in action - an emancipation from chance and fatality. "Thought" represents the suggestion of a way of response that is different from that which would have been followed if intelligent observation had not effected an inference as to the future.
Theorists will often complain that experimentalists ignore their work. Let a theorist produce just one theory of the type sketched above (i.e., one that makes nonobvious verified predictions) and the world will jump to the conclusion (not always true) that he has a special insight into difficult problems.
It is all too easy to make some plausible simplifying assumptions, do some elaborate mathematics that appear to give a rough fit with at least some experimental data, and think one has achieved something. The chance of such an approach doing anything useful, apart from soothing the theorist's ego, is rather small..
The basic trouble is that nature is so complex that many quite different theories can go some way to explaining the results.... What constraints can be used as a guide through the jungle of possible theories? It seems to me that the only useful constraints are contained in the experimental evidence.