UNLV geoscientist Eugene Smith

The Shards of Time

How a vacation in South Africa, a one-of-its-kind UNLV lab, and pieces of volcanic glass smaller than a grain of salt changed a long-held view of human history.

UNLV emeritus geosciences professor Gene Smith (right) and colleagues identified glass shards from 74,000-year-old volcanic eruption for study in this week's edition of the journal Nature. (UNLV Creative Services)

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