Biological warfare

Poster symbolizing the Ele Não Movement.

The Zimmermann telegram as it was sent from Washington, D.C. , to Ambassador Heinrich von Eckardt , the German ambassador to Mexico .

The eight "Chicago Black Sox"

Unit 731 aircraft dropped ceramic bombs packed with plague-infected fleas over 11 Chinese cities. Ceramic shattered on impact without incinerating the fleas — a design detail that took years to engineer.