Science: Diggers

Coconut Planter Rufino Flores Velez was riding along a Mexican trail near the isolated village of Rio Grande in the southwest corner of Oaxaca state. When his horse kicked the corner of a stone sticking out of the dust, he hopped off, investigated, and gathered a gang of peasants to dig up the stone. It weighed about three tons, but at last the peasants managed to turn it over. The underside was covered with elaborate carvings that looked to non-archeological eyes like a man and woman embracing.

Hill of the Toad. Flores duly reported his find, but nothing was done until two...

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