50 years ago, mysterious glass hinted at Earth’s violent past

Excerpt from the August 11, 1973 issue of Science News

A selection of tektites

Like Hansel and Gretel followed a trail of breadcrumbs, scientists have followed glassy particles called tektites (some shown) to the sites of major meteorite impacts around the world.

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Microtektites found in Caribbean may shed light on tektite origin Science News, August 11, 1973

Though their origin remains a mystery to scientists, huge strewn fields of tektites have been found in widely separated areas of the world….