This is The Guardian.

When President Trump first announced Operation Epic Fury on Truth Social,

he offered a multitude of reasons for going to war with Iran.

Defending the U.S., liberation for the Iranian people, the destruction of Iran's missile industry,

and the elimination of an imminent nuclear threat.

This terrorist regime can never have a nuclear weapon. I'll say it again. They can never have a nuclear weapon.

I'll say it again.

They can never have a nuclear weapon.

Iran's key nuclear facilities were supposedly obliterated by the U.S. and Israel last June. In Operation Midnight Hammer last June, we obliterated the regime's nuclear program

at Fordot, Natanz and Isfahan. But according to the world's nuclear watchdog, the International

Atomic Energy Agency, or IAA, Iran still has a stockpile of 440 kilograms of 60% enriched uranium,

likely hidden in tunnels somewhere beneath Isfahan.

So how close was Iran to being able to build a bomb?

Did they actually plan to?

And what happens to Iran's uranium now?

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

Kelsey Davenport, your director of non-proliferation policy at the Arms Control Association.

To start with, just give me a potted history of Iran's nuclear ambitions, as in what were their

stated goals and were their actions consistent with those goals?

So Iran's nuclear intentions have shifted over time.

And in the 1950s, when countries began to be interested in civil nuclear power and the

applications of nuclear for things like medical work. The Shah of Iran actually approached

...