Choose the best word for each blank. well-trained, irregular, cumulative, contribute, chance, theory, search, projects, achievements, breakthroughs. The development of science has been and sometimes even illogical. Great discoveries are usually the result of the contributions and experience of many workers, even though the credit for formulating a or law is usually given to only one individual. There is, of course, an element of luck involved in scientific discoveries, but it has been said that “ favors the prepared mind”. It takes an alert and person to recognize the significance of an accidental discovery and to take full advantage of it. More often than not, the public learns only of spectacular scientific . For every success story, however, there are hundreds of cases in which scientists have spent years working on that ultimately led to a dead end. And in which positive came only after many wrong turns and at such a slow pace that they went unheralded. Yet even the dead ends something to the continually growing body of knowledge about the physical universe. It is the love of the that keeps many scientists in the laboratory.