You can't really explain these things, but you might be able to explain this guy. >In 1971, Harlow's wife died of cancer and he began to suffer from depression

You can't really explain these things, but you might be able to explain this guy. >In 1971, Harlow's wife died of cancer and he began to suffer from depression. He was treated and returned to work but, as Lauren Slater writes, his colleagues noticed a difference in his demeanor.[6] He abandoned his research into maternal attachment and developed an interest in isolation and depression. From the wikipedia page.