1. Unit 731
Suggested by Lurker8.
Unit 731 was a unit of the Japanese Imperial Army that carried out brutal (and, in many cases, lethal) experimentation on human beings during World War II under the guise of chemical and biological research. For the majority of the time it was active, the unit acted under the command of General Shiro Ishii, and was responsible for the deaths of up to 250,000 people. The worst part? Instead of being put on trial for human experimentation, the people involved with the unit were granted immunity by the US government in exchange for the data they had gathered.
Suggested by onemellocello.
In 2005 Natalee Holloway, an 18-year-old from Mountain Brook, Alabama, disappeared during her high school graduation trip to Aruba. She was last seen in a car with three men – Joran van der Sloot, Deepak Kalpoe, and Satish Kalpoe. While each of the men has been arrested several times in connection with Natalee's disappearance, they were always released due to lack of evidence. Exactly five years to the day after Natalee's disappearance, 21-year-old Stephany Tatiana Flores Ramírez went missing in Peru. Her dead body was discovered three days later in a hotel room registered to Joran van der Sloot. While Van der Sloot pleaded guilty to Ramírez's murder, Natalee Holloway's disappearance remains unsolved.
A feral child is basically a person who has lived in isolation from human contact from a young age, and therefore has no experience of human behaviour. Again, this article itself is more of a wormhole into an infinity of ridiculously interesting articles you won't be able to stop reading. I once spent an entire night reading about Genie (the girl in the photos), who until the age of 13 was kept locked alone in a room by her father. Upon being rescued from her abusive family home, Genie was taken into government care and became the subject of examinations and research into human behaviour. Her article alone (and the documentary you can find on YouTube) are enough to keep you occupied for hours.
Suggested by Meghan Carcionne, Facebook.
Homer and Langley Collyer were brothers who lived in Harlem, New York, during the first half of the 20th century. They inherited their house on Fifth Avenue after their mother died, and after a few years they became withdrawn, isolating themselves from society. In March 1947, after an anonymous source complained about the smell coming from their house, the brothers' bodies were found surrounded by over 140 tonnes of obsessively hoarded books, furniture, and musical instruments – all of which was protected by booby traps to ward off intruders.