This week, researchers see cancer spread between species.

Here we're seeing kind of a supermetastasis where the tumor cells acquire a really amazing

new ability to jump from one individual to another and then apparently even occasionally

from one species to another.

And LIGO spots more gravitational waves.

Astronomers scramble to explain exactly what's causing them.

Theory people have come up with all their theories, but now the data's peak.

Plus figuring out the taxonomy of subatomic particles.

This is the Nature Podcast for June the 23rd, 2016.

I'm Kerry Smith.

And I'm Adam Levy.

Cancer's are caused by mutations in cells which lead to abnormal cell growth.

Many cancers can spread throughout the body in a process called metastasis.

But in some rare cases, cancer cells can spread even further,

beyond the body of their host, to different individuals in a sort of supermetastasis.

These transmissible cancers are very rare,

and only a handful of cases have been documented until now.

Nature reporter Ewan Calloway spoke with Stephen Goff from Columbia University in New York,

who's been looking into a new type of transmissible cancer identified in clams, muscles,

and other mollusks. Stephen started with a bit of background on transmissible cancers.

We think of transmissible cancers as exceedingly rare.

There are only really two examples known in mammals,

...