After a brief(ish) hiatus, Historical Thursday is back! Spring has finally sprung in most places, so what better way to celebrate its and HT’s return than by profiling a device intended to change the very weather above us: the cloud-seeding silver iodide rocket. Ever get so tired of the rain that you wish you could just make the clouds dump it all out and get it over with? You’re not alone: in July of 1946, Vincent Schaefer, a machinist at General Electric, and Irving Langmuir, a Nobel Laureate, were climbing Mt.