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.

Yacold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtolt, visit yawcult.co.

.jp. That's Y-A-K-U-Lt.C-O.jp. When it comes to a guide for your gut, count on Yacolt.

This is Scientific American 60 Second Science.

I'm Ashley Pat.

You might say that Guillermo Pons is a scientific monster hunter,

even though he thinks that term, monster, never really captured his subjects right.

So there are regular animals that have gone through different developmental processes

that would end up building a body that is not what you expect.

What this researcher based in Madrid, Spain, actually loves, is the oddly amazing animals.

After all, he studies two-headed worms. We have these worms that are

usually regular worms, like with one head and one tail, and that's normal, but sometimes they

may have two heads or two tails. And on the other side, there are worms which have one head

and many tails always. Officially, he looks at bifurcated anilids, meaning things like earthworms that have come out of their larval stage with two heads,

or spontaneously sprouted two tails, or some other combination of mixed-up appendages.

We know that certain species, like some salamanders and insects, have

the ability to regrow appendages in a time of need. But there's this one phylum of worms,

the anilids, that can regrow unlike anything else that we've ever seen in the kingdom.

Their segmented bodies, like an earthworm with rows of ringed compartments,

help them easily regrow a new head or tail at the first sign of trouble. Or even crazier,

...