Bacteria bomb made of ceramic used by the Japanese Imperial army Unit 731 during WWII, Quzhou City, Zhejiang Province, China

bacteria bomb ceramic unit 731 japanese army wwii quzhou experiments infection diseases military technology wartime history human experimentation weaponry historical artifact imperial japan public health biowarfare pathogens medical ethics china war crimes occupancy site studies conflict bioengineering asian population control germ warfare toxic agents medicine research chemical weapons 20th