This is the sound of crowd science.

We shoot a laser beam at this atom.

Is that a big canister of oxygen in the background?

Oh, there's a wasp in there.

Yeah, perhaps possibly the most disgusting thing I heard this morning.

But it's one of the nicest fun facts you're going to hear today.

So here I'm actually holding a donut.

What are you going to do with that?

Find out more at the end of this podcast.

Hello and thank you for downloading this episode

of the witness history podcast from the BBC World Service.

42 years ago, Saddam Hussein sent troops into Iran,

marking the beginning of the Iran-Iraq war.

Alan Johnston spoke to BBC presenter Poonigadoosi,

who was just a child when it started, about her memories of that time.

It's September the 22nd, 1980,

and the Iranian capital Tehran is bracing for war.

Saddam Hussein's Iraq has just launched an invasion.

But at the time, one little girl found it hard to take the dangers seriously.

I remember not being allowed to turn the lights on in our house,

because everybody in the whole city was supposed to keep their lights off

so that the airplanes would not know where the capital is

...