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Hello.

Welcome.

Science.

And that is the same physics, medicine, nature, space, time, the brain, life, the universe.

Hello, this month we're exploring the science of our special senses.

So far, we've heard how our ears work, we've looked

the visual system in the eye, and this week we're getting our teeth into the science of taste.

Plus, news of a discovery that could rewrite the story of human origins,

how some antibiotics can also block viruses,

and how ants keep infections at bay in their colonies.

I'm Georgia Mills.

I'm Chris Smith, and this is the Naked Scientists.

The Naked Scientists podcast is powered by UKfast.co.uk. The story of how and when the first anatomically modern humans migrated out of Africa and

spread around the world has been challenged

this week by a new fossil discovery from Saudi Arabia.

A bone from a middle finger, together with hundreds of stone tools, has been uncovered and dated to a time much earlier

than scientists have believed that our ancestors first left the African continent.

Georgia spoke with study author Hugh Grocut.

The textbook view of human origins at the moment suggests that our species Homo sapiens

...