11+ hour, 54+ min ago  (329+ words) Xinhua 05 Jul 2026, 15: 16 GMT+10 HARBIN, July 5 (Xinhua) -- A book launch in northeast China's Heilongjiang Province on Sunday unveiled previously unpublished archival evidence exposing the germ warfare crimes perpetrated by notorious Japanese Unit 731 during WWII. Written by historian Jin Chengmin, "Black Box:…...