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Scientific discovery is popularly believed to result from the sheer genius of such intellectual stars as naturalist Charles Darwin and theoretical physicist Albert Einstein. Our view of such unique contributions to science often _________ the person’s prior experience and the efforts of their lesser-known predecessors (前任者).

_________ such greats as Darwin and Einstein—whose remarkable contributions are duly celebrated — we suggest that innovation is more a process of trial and error, where two steps forward may sometimes come with one step back, as well as one or more steps to the right or left. This evolutionary view of human innovation weakens the idea of _________ genius and recognizes the accumulative nature of scientific progress.

Consider one _________ scientist: John Nicholson, a mathematical physicist working in the 1910s who assumed the existence of ‘proto-elements’ in outer space. By combining different numbers of weights of these proto-elements’ atoms, Nicholson could recover the weights of all the elements in the then-known periodic table. These successes are all the more noteworthy given the fact that Nicholson was _________ about the presence of proto-elements: they do not actually exist. Yet, amid his often fanciful theories and wild guesses, Nicholson also _________ a new theory about the structure of atoms. Niels Bohr, the Nobel prize-winning father of modern atomic theory, _________ this interesting idea to come up with his now-famous model of the atom.

What are we to make of this story? We propose that science is constantly _________, much as species of animals do. In biological systems, organisms may display new characteristics that _________ random genetic mutations (变异). In the same way, random or accidental mutations of ideas may help pave the way for __________ in science. __________ mutations prove beneficial, the animal or the scientific theory will continue to thrive and perhaps reproduce.

__________ for this evolutionary view of behavioral innovation comes from many domains. Consider one example of an influential innovation in US horseracing. The so-called ‘acey-deucy’ stirrup (马镫) placement, in which the rider’s foot in his left stirrup is placed as much as 25 centimeters lower than the right, is believed to give important speed advantages when turning on egg-shaped tracks. It was developed by a relatively unknown jockey named Jackie Westrope. Had he __________ the speed advantage that would be provided by riding acey-deucy? No. He suffered a leg injury, which left him unable to fully bend his left knee. His __________ just happened to coincide with enhanced left-hand turning performance.

Plenty of other stories show that fresh advances can arise from error, misadventure, and also pure serendipity — a happy __________. The time seems right for abandoning the naive notions of intelligent design and genius, and for scientifically exploring the true origins of creative behavior.