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A "Wandering Meatloaf" With Iron Teeth and a Nearly Complete Chinese Dinosaur


A very odd mollusk that has been nicknamed the “wandering meatloaf” has been studied and it turns out that it has teeth made of a rare iron mineral that was only ever found along rocky coastlines. The mollusk, which is scientifically named
Cryptochiton stelleri, has a reddish-brown flat oval-shaped body with a shell and can grow as long as 14 inches (it really does look like a wandering meatloaf).
Since its teeth contain the rare iron mineral santabarbaraite, it can easily grab food from rocks. In fact, this is the first time ever that the mineral has been found in a living organism. In a statement, Derk Joester, who is an associate professor of materials science and engineering at Northwestern University in Illinois, described this mineral in further detail, “[Santabarbaraite] has high water content, which makes it strong with low density. We think this might toughen the teeth without adding a lot of weight.” ....

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Sharks Nearly Went Extinct 19 Million Years Ago From Mystery Event


Sharks Almost Went the Way of the Dinosaurs 19 Million Years Ago
Analysis of the fossil record shows a mysterious mass extinction that decimated the diversity of sharks in the world’s oceans, and they’ve never fully recovered.
Microscopic scales that cover the bodies of sharks, called dermal denticles, are a valuable resource for scientists studying sharks’ history.Credit.Jeff Rotman/Science Source
By Katherine Kornei
June 3, 2021Updated 2:22 p.m. ET
Extinctions that obliterate wide swathes of life have reshaped Earth’s history. Typically triggered by a massive environmental change like an asteroid impact or a significant shift in climate these events give scientists an intimate look at how life recovers after a cataclysm. Researchers believe they’ve now pinpointed a previously unknown planetary-scale reset that occurred about 19 million years ago. ....

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