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Do you dream of discovering rugged coastlines, lush landscapes and lively city markets,

then sail from Portsmouth or Plymouth directly to Santander with Brittany ferries

and experience Spain like never before.

Wind through the city's charming streets before sampling Santander's succulent fresh seafood.

Trace your way through history at the Palacio de Magdalena, then absorb the panoramic views of the white sand bays.

Reimagined your Spanish adventure and visit the guardian.com forward

slash Brittany Ferries Cantabria. This message was paid for by Brittany Ferries.

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This week, we're answering your questions on the microbiome with James Kinross, a colorectal surgeon at Imperial College, London, and author of Dark Matter, the new science of the microbiome.

If you missed it, in Tuesday's episode,

we heard about how the ecosystem of bacteria, fungi,

and other microorganisms begins to form.

You'll get this big super bloom event

as suddenly great big blooms of bifida bacteria will

grow out in the gut, and you'll begin to be colonised as you interact with the world around you.

...