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Fiery World - Book 2 (1934) - 352:
352. Attention should be paid to each invention of the scientists. They must first of all be responsible for the harmlessness of a new substance. Many metals are being brought into daily use, not only in their pure state but also in combinations. As for that, alloys have attracted human attention from the earliest times. Truly, many useful metals when combined in a certain way produce deadly effects.
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