On June 25, 2014, the following scientific study made the cover of the prestigious journal, Nature: “Aspergillomarasmine A overcomes metallo-β-lactamase antibiotic resistance.” Doesn’t exactly sound earth-shattering, does it? But the discovery of a fungal compound that restores the efficacy of one of our antibiotics of last resort is, in fact, huge news.

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This week we have a very special fossil courtesy of Fossil Friday fan Dan Phelps—who also happens to be the president of the Kentucky Paleontological Society. What could it be? Looks like some sort of plant pod to me, or an ancient sloth zipper?

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Last week, I presented you with a set of mammal molars that were neither mastodon nor mammoth. Dan Phelps was the first to identify it as one of the Gomphotheriidaea four-tusked relative of the elephant. 

From the UCMP:

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Happy Fourth of July, everyone! This week on Fossil Friday, I’m bringing you a special request from last week’s winner—a mammal. This genus is found everywhere, except for Antarctica and Australia, but this fossil in particular comes from Nebraska. Go USA!

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Last week on Fossil Friday, I presented you with a tricky identification task. This egg-shaped rock was far afield from the jaws, spines and shells you've been used to.

So what was this unique rock? It was a dinosaur gastrolith from the late Jurassic!

What is a gastrolith?

From the UCMP:

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Last week’s winner of Fossil Friday, GrizzlyD, requested that we do a pseudofossil this week.

“I work at a museum and have to crush many hopes of ‘dinosaur eggs’ that are just round rocks,” he said.

But why would I give you a pseudofossil, when I have a giant archive of real fossils to work from?

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Did former New York Mayor Michael Bloomberg, former Treasury Secretary and Goldman Sachs CEO Hank Paulson, and retired hedge fund-turned climate action advocate Tom Steyer–the three musketeers behind the just-published Risky Business report–ever see the 1983 movie Risky Business?

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Raymond M. Alf Museum of Paleontology, Claremont, California. 

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