We independently review everything we recommend. We may get paid to link out to retailer sites, and when you buy through our links, we may earn a commission. Learn more› by Nancy Redd We’ve tested 67 ...
This is a follow-up to a story that appears in the June 2018 issue of National Geographic magazine. On a fall morning in 1937, an Emory University geologist was walking down a hallway in the alumni ...
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