Can you build a microscopic nuclear bomb?

Inertial confinement Fusion as has been practical and repeatable (first-time every-time) since 1952 and the Ivy Mike nuclear test. read more

In principle, if you can compress fission or fusion fuels to extremely high densities very small nuclear explosions could be created (tens to hundreds of milligrams of nuclear fuel). Work has been underway for decades to attempt this, the largest such facility is the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory. read more

The easiest nuclear bomb to make would be a fision bomb like the ones used on Hiroshima and Nagasaki. But saying "the easiest to make" is not very helpful. The first thing needed would make it impossible for any individual to make one. read more