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Science.

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

Hello, this week, medical uses of cannabis.

What's the hype and what's the reality?

We hear from the people who grow it and the people who want to use it.

Plus in the news, scientists grow replacement lungs in a lab.

Why a knock on the head can lead to dementia years later and the very tiny thing that elephants are terrified of and no it's not a mouse.

I'm Isie Clark.

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

The Naked Scientists podcast is powered by UKfast.co.uk. Now thousands of people die every year on transplant waiting this. They're just

enough donor organs to keep up with demand.

Which is why the announcement this week by scientists in the US

that they've managed to grow in a culture vessel called a bioreactor new

human-sized lungs that can be implanted successfully into pigs

is a huge step forward. Joe Nichols is at the University of Texas Medical Branch at Galveston.

There are never enough donor organs for people who need to have a

lung transplant and that's people with severe lung disease who we can't do

anything for. People that do go on to transplant lists, have long weights for organs, and many people even die before they

...