Radiation therapists are unregulated in 15 states, imaging technologists in 11 states and medical physicists in 18 states, according to the technologists association.

根据技术协会，辐射治疗在15个州比较混乱，还有11个州的图像技术员，18个州的医疗物理学家们。

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So we have engineers, scientists, mathematicians, medical doctors and physicists.

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All have the merit of reminding the reader just how far scientific knowledge has advanced in the century since the prizes were first awarded. (In 1901, for example, many respectable physicists did not believe that atoms were real.) The medical chapter also shows how provisional scientific knowledge can frequently be.

ECONOMIST: Nobel prizes