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African slaves were very expensive (50 Sterling). Irish slaves were cheap (no more than 5 Sterling) and most often were either kidnapped from Ireland, or forcibly removed. They could be worked to death, whipped or branded without it being a crime. Many times they were beat to death and while the death of an Irish slave was a monetary setback, it was far cheaper than the death of an expensive African. African slaves were treated much better in Colonial America.
Physician Eugene Lazowski discovered injecting healthy patients with dead bacteria could cause them to test positive for epidemic typhus without experiencing any symptoms. He & a friend worked secretly to inject thousands of Poles, deliberately creating the appearance of an epidemic. Fearful of contagious illness, Nazis quarantined the villages rather than sending them to concentration camps.
The newly invented Kodak roll-film camera was used by wealthier German officers to take home 'mementoes' of their time in Namibia Germany experiments on Africans.