If a robotic earwig can make it into your ear, it can kill you with milligrams of simple poison. Critical mass for plutonium is 10 KG. A nuke needs to be super

If a robotic earwig can make it into your ear, it can kill you with milligrams of simple poison. Critical mass for plutonium is 10 KG. A nuke needs to be supercritical, plus the mechanism of the bomb itself. Smallest nuke ever built is 50kg, https://en.m.wikipedia.org/wiki/Davy_Crockett_(nuclear_device) https://en.m.wikipedia.org/wiki/Davy_Crockett_(nuclear_devic... Smallest nukes were phased out by all major nations because there is too much risk of them getting lost, falling into wrong hands, being used without authorisation, etc. Several 'big' nukes were already lost and never found