The Hello and

Welcome to the Naked Scientists with me Georgia Mills and with Chris Smith.

This week as World Blood Day approaches we delve into the history of blood letting, explore

the process of blood donation, and find out about new techniques to make blood that anyone

can use safely.

Plus, the science behind the headlines, including a new test to reveal every virus infection

you've ever had.

The Large Hadron Collider fires up again after a two-year shutdown and a new weapon in the fight against Ebola.

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The world's biggest particle accelerator the Large Hadron Collider

has been successfully restarted this week after a two-year maintenance

shutdown.

Now it's back to smashing together protons, which are the positive particles that sit at the

centres of atoms, and this is going to help scientists to glimpse

what the universe is made of we hope.

Gerejaxon went to Cern to meet the LHC's head of operations, Mike Lamont.

The LHC is 27 kilometers in circumference and it's divided into eight sectors and the first stage is to actually

cool the magnets down so most of the magnets in the LHC is superconducting

They're called to 1.9 Kelvin.

Pretty cold?

Chilly. Yeah, this is colder than outer space.

And once the whole sector is cold, then we can start putting current into the

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