It has been well said that a general idea of what radioactivity signifies is a necessary part of the education of every intelligent person, since “it is the one thing of paramount importance in the chemical and physical science of the day.” But its importance extends much farther, since radioactivity is now employed in many departments of industry, as well as in biology and medicine. It is known that the rays from radium have the power to stimulate all forms of life, even to the extent of speeding up the growth of plants and of making dormant plants burst into bud. Some authorities, as we shall see later, are fully convinced that the radiations can be employed successfully in the prolongati…
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