| 21. | This event marks the beginning of Nectarian period of the lunar geologic timescale.
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| 22. | Homogeneous nucleation is assumed to be negligible on the timescale of this experiment.
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| 23. | Plastics aren't biodegradable on any human timescale.
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| 24. | Each stage being of a variable timescale-perhaps over billions of years.
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| 25. | The timescale of these changes is about 25 years.
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| 26. | This is a very, very tight timescale,
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| 27. | The archaeological evidence agrees with this earlier timescale.
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| 28. | The expansion occurred on a much shorter timescale.
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| 29. | The short timescale of interconversion precludes the separation of conformational isomers in many cases.
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| 30. | RPE works on a longer timescale than cleanup.
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