Nuclear Threat Awareness Quiz

This quiz appears in todays Washington Post. It asks some pretty obscure questions. I answered 7 out of 11 correctly. But I dispute the answer to question #4:

4) True or False. Making a nuclear bomb takes a vast effort with hundreds of scientists like the U.S. Manhattan Project, so it's extremely unlikely a terrorist group could ever do it.

Making a uranium bomb is easy, but enriching the uranium is extremely difficult. Making a plutonium bomb is much more difficult. So a terrorist group could make a uranium bomb if they had access to enriched uranium.

You can go here to see which countries have nuclear material. You need about 50 Kg of highly enriched uranium to make a nuke.