Science: Stones & Bones

Almost every morning since last November, a long-shanked, ruddy-faced man carrying a geologist's pick has stomped his hobnailed boots through the lobby of Mexico City's Hotel Geneve. Every evening he has returned, dusty or muddy, frequently carrying a heavy bag. The hotel's turistas speak of him as "The Prospector."

But Dr. Hellmut de Terra, a geologist turned archaeologist, is not after gold, but bones and stones. In the last 15 years he has carried his pick over much of the world's surface on the trail of prehistoric man. Dr. de Terra's current quarry...

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