Wolverine's adamantium claws are iconic in both the X-Men movies and Marvel Comics, but we still can't explain how Logan actually controls them.

Paleontologists unearthed the fossil in Mongolia’s Gobi Desert, and the find is unique because of a sheath preserved on one of the digits, which reveals the claw’s true length.

One of the claws retained its outer covering – a sheath of keratin, the same material as in our fingernails – rather than just the underlying bone. The keratin sheath added more than 40% to th ...

This preservation gives researchers an accurate view of the claws' actual morphology, far more imposing than the underlying bone alone would suggest. Microscopic analysis even reveals characteristic ...

“So that’s really important as we know there’s a pretty uncertain relationship between the keratin and the underlying bone,” he added via email. Most therizinosaurs had long claws to grab ...