A man in Sweden was arrested after he contacted authority to see if his "atom splitter" is safe to run.
This is where a little knowledge can be dangerous, or even harmful, physically. It is what happens when crackpots crossed the line between doing things in their heads and actually doing something.
The 31-year-old Handl said he had tried for months to set up a nuclear reactor at home and kept a blog about his experiments, describing how he created a small meltdown on his stove.
Only later did he realize it might not be legal and sent a question to Sweden's Radiation Authority, which answered by sending the police.