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new episodes. It's been another busy week on the science desk here at the Guardian.

As coronavirus continues to mutate, a new study has revealed why some people might not have caught it, and it seems it's all in the nose.

Plus, a new blood test can detect Parkinson's years before symptoms arise.

The test uses artificial intelligence to predict markers in a patient's blood.

It's hoped it could one day help find treatments to stop or slow down the onset of the disease.

And concerns over Chinese access to British science and technology.

All that and an awakening black hole as we break down some of the biggest stories of the last seven days.

I'm the Guardian Science Editor Ian Sample and this is Science Weekly.

I'm joined by science correspondent Hannah Devlin.

Hi Hannah.

Good morning.

Now there's been some interesting reporting on coronavirus over the past week, including some

new research into why some people might not have caught it.

Tell us a bit more about that study.

What's its findings?

Yeah, so I mean, I think everyone will relate to this idea that there's some people who

seemed to get COVID every single time it was doing the rounds and then other people just

...