Frasi di Francis Crick
Data di nascita: 8. Giugno 1916
Data di morte: 28. Luglio 2004
Francis Harry Compton Crick è stato uno scienziato britannico, premio Nobel per la medicina nel 1962.
Frasi Francis Crick
„Anche se disponessimo di un miliardo di scimmie che sappiano scrivere a macchina è quasi nulla la possibilità che esse riescano a scrivere correttamente, durante un periodo pari all'età dell'universo, anche una sola terzina di Dante… abbiamo quindi scoperto che… esistono strutture complesse che si presentano in molte copie identiche, che hanno cioè una complessità organizzata, e che non possono essere nate per caso. La vita, da questo punto di vista, è un evento infinitamente raro, tuttavia la vediamo brulicare intorno a noi. Come è possibile che una cosa così rara sia così comune?“
„I wasn't aware of Chargaff's rules when he said them, but the effect on me was quite electric because I realized immediately that if you had this sort of scheme that John Griffith was proposing, of adenine being paired with thymine, and guanine being paired with cytosine, then you should get Chargaff's rules. I was very excited, but I didn't actually tell Chargaff because it was something I was doing with John Griffith.... This was very exciting, and we thought "ah ha!" and we realized - I mean what anyone who is familiar with the history of science ought to realize - that when you have one-to-one ratios, it means things go to together. And how on Earth no one pointed out this simple fact in those years, I don't know.“
„An honest man, armed with all the knowledge available to us now, could only state that in some sense, the origin of life appears at the moment to be almost a miracle, so many are the conditions which would have had to have been satisfied to get it going. But this should not be taken to imply that there are good reasons to believe that it could not have started on the earth by a perfectly reasonable sequence of fairly ordinary chemical reactions. The plain fact is that the time available was too long, the many microenvironments on the earth's surface too diverse, the various chemical possibilities too numerous and our own knowledge and imagination too feeble to allow us to be able to unravel exactly how it might or might not have happened such a long time ago, especially as we have no experimental evidence from that era to check our ideas against.“
— Francis Crick
New York NY: Simon & Schuster, 1981, p. 88.
„Philosophers have been especially concerned with the problem of consciousness—for example, how to explain the redness of red or the painfulness of pain. This is a very thorny issue. The problem springs from the fact that the redness of red that I perceive so vividly cannot be precisely communicated to another human being, at least in the ordinary course of events. If you cannot describe the properties of a thing unambiguously, you are likely to have some difficulty trying to explain these properties in reductionist terms. <!-- 9“
„What is found in biology is mechanisms, mechanisms built with chemical components and that are often modified by other, later, mechanisms added to the earlier ones. While Occam's razor is a useful tool in the physical sciences, it can be a very dangerous implement in biology. It is thus very rash to use simplicity and elegance as a guide in biological research. While DNA could be claimed to be both simple and elegant, it must be remembered that DNA almost certainly originated fairly close to the origin of life when things were necessarily simple or they would not have got going.
Biologists must constantly keep in mind that what they see was not designed, but rather evolved. It might be thought, therefore, that evolutionary arguments would play a large part in guiding biological research, but this is far from the case. It is difficult enough to study what is happening now. To figure out exactly what happened in evolution is even more difficult. Thus evolutionary achievements can be used as hints to suggest possible lines of research, but it is highly dangerous to trust them too much. It is all too easy to make mistaken inferences unless the process involved is already very well understood. <!-- pp.138-139“
„The ultimate aim of the modern movement in biology is in fact to explain all biology in terms of physics and chemistry.“
— Francis Crick
Seattle: University of Washington Press, 1966, p. 10.