15. The Three Identical Strangers Study
In the 1960s, triplets were separated at birth as part of a secret study on nature versus nurture, each placed in different families without their knowledge. They discovered each other decades later, learning their lives were manipulated for research. The study, led by psychologist Peter Neubauer, aimed to understand human development by observing identical siblings raised in varying environments. The ethical violations and psychological impact on the triplets have been widely criticized. (bbc.com)