One of the first things many kids—or even adults—may do when they are on a beach or dune is to make patterns in the sand, or sculptures in the form of sandcastles. Many generations of humans have ...
Russia and Alaska's current coastlines (the dashed black lines), compared to ancient Beringia (shown in green), the land bridge that brought humans to North America. Image via William Manley, ...
A rock surface containing a circular pattern with a central depression. The scale bar = 10 cm. Images modified from: Helm, C.W.; Cawthra, H.C.; De Vynck, J.C.; Helm ...
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