Hallucinatory ‘voices’ seem to be shaped by local culture. In the U.S., the voices are harsh and threatening while those heard by schizophrenics in Africa and India tend to be more benign and playful.

People with relatively prudent and reliable partners tend to perform better at work, earning more promotions, making more money, and feeling more satisfied with their jobs, according to research.

Oldest siblings tend to earn better wages, receive more education than other children of the family, and have higher IQs. Apparently, parents tend to give more mental stimulation to their first-born children than they do to the others.