A billet of highly enriched uranium

What Is Enriched Uranium?

And what does it mean that Iran has enriched uranium past the 4.5% level?
Two IAEA experts examine recovery work on top of Unit 4 of TEPCO's Fukushima Daiichi Nuclear Power Station

How to Clean Up After a Nuclear Disaster

Workers are still cleaning up after the 2011 Fukushima Daiichi nuclear power plant partial meltdown. There's a lot of contaminated material to contend with.
Atom earth

Atoms for… Peace?

Iran's nuclear program is in the news, again. But what's the backstory on how the country went nuclear in the first place?
Nuclear power plant

Nuclear Power Without the Meltdowns?

When it comes to nuclear power, one word in particular instills fear: meltdown. But what is a meltdown? Can one be avoided?
Laser preamplifier

The Problem With Nuclear Fusion

For decades physicists have pursued a long-shot approach to clean power—nuclear fusion.
Broken windows in Prypiat, Chernobyl

Chernobyl: Can Wildlife Return After the Blast?

For 30 years we have assumed that no life would return to Chernobyl after the nuclear disaster there. We may be wrong.