Scientific advances can be made either in a dramatic and revolutionary manner or in a slow evolutionary way, sometimes covering a span of several years. An example of the latter process is the diamond‐anvil pressure cell, which in about a decade and a half has developed in stepwise fashion from a rather qualitative instrument to the sophisticated quantitative research tool it is today, capable of reaching static pressures in the megabar range.

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To conserve space, references to most papers from NBS may be found in
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2.
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References to names mentioned in this section on radioactive decay may be found in
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19.
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