Understanding the human body is a team effort. That's where the Yachtel group comes in.

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

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When it comes to a guide for your gut, count on Yacolt.

This is Scientific American's 60-second science. I'm Christopher in Tal-Jata.

The universe is littered with black holes, but where exactly they're all hiding? Well,

that's a little harder to say. Our current inventory of black holes is still highly incomplete.

Yale astronomer Priya Natarajan says black holes present unique challenges to those

keeping count. These are dark objects that have such peculiar properties that you can never

directly quite image them like we image galaxies, and therefore we have to infer their presence indirectly.

Natarajan and her colleagues recently predicted there might be a large population of previously

undetected supermassive black holes, just wandering around galaxies.

But supermassive black holes are, as the name implies, massively large, which makes them

easier to detect, compared to their relatively tiny cousins, so-called stellar mass black holes.

Those are closer in mass to our sun.

If you have a stellar mass black hole, it doesn't have the same oomph.

So it's trickier to detect them.

Now, researchers in Europe claim to have stumbled upon an unexpected trove of these stellar mass black holes

in a puffy star cluster called Palomar 5.

In the paper, we call it it the Rosetta Stone.

Mark Helis is an astrophysicist with the University of Barcelona and the Catalan Institute

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