Alex Ritson

We've got the masks on because we've been told there's been a bit of tear gas and pepper spray already.

This is a peaceful protest.

The protesters not moving.

What we are doing is legal.

We saw really an hours-long standoff between those two sides.

So there's a continuing sense of tension, suspicion and concern in this city ahead of what is likely to be another weekend of protests.

Tom Bateman reporting.

Still to come in this podcast...

There is no evidence that paracetamol increases the risk of autism, ADHD or intellectual disability.

A major international scientific study disputes one of President Trump's pet theories.

First, they told the story of the moon landing.

Then came the dramatic rescue of the Apollo 13 mission.

I literally got on my knees and prayed.

Now from the BBC World Service, 13 Minutes presents The Space Shuttle, the inside story of a dream to revolutionize spaceflight.

We had so much riding on something we'd never done before.

Unlike anything that had ever flown in space.

This is the space shuttle.

Roger all.

We're just hooting and hollering and screaming and yelling for the sheer joy of what you were taking in.

13 Minutes presents The Space Shuttle.