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sauropod tracks and cast

Tracks made by sauropods some 170 million years ago crisscross a swath of land in Scotland (left); a sediment cast of one track (right) stretched longer than 35 centimeters (lens cap is 5 centimeters wide).

Fossil Finder screenshot

INTERNET SEARCH  To better understand the past environment of Kenya’s Lake Turkana Basin, asks volunteers to scrutinize thousands of aerial photos taken at the site.

Ptyas mucosa fossil

SEE-THROUGH SKULL  X-ray scans of the skulls of lizards and snakes, including Ptyas mucosa, the oriental rat snake, reveal clues that today’s snakes descended from burrowers.

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