Explanation: During WW2, Unit 731 was a ‘medical’ experimentation division of the Imperial Japanese military which performed horrific experiments on living subjects - mostly Chinese civilians and PoWs - which had… minimal scientific value. Don’t look up details unless you have a strong stomach, but suffice it to be said, very little was learned, and what little was ‘learned’ was performed with extremely subpar scientific methodology, making it near-worthless.