> Little Boy actually fired a 38.5kg cylinder onto a stationary 25.6kg plug. Each half of the pit would have been supercritical, if they were spherical. I’d fo

> Little Boy actually fired a 38.5kg cylinder onto a stationary 25.6kg plug. Each half of the pit would have been supercritical, if they were spherical. I’d forgotten that, if I ever knew it. Super interesting.