Some people like going to bed early in the evening and waking up at the crack of dawn. Others are most alive after the Sun has set, preferring the darkness of night to the brightness of morning. Research into chronotypes (the propensity to sleep at a particular time during a 24-hour day) shows that people do indeed have stable individual differences in their activity levels at different times of the day. At one end of the continuum are the ‘morning larks’; at the other, ‘night owls’. Although the exact cause of the differences in chronotypes has yet to be unravelled, they are likely to have some genetic influence.

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Psychopaths Have Feelings: Can They Learn How to Use Them?

Could neuroscience help a Jeffrey Dahmer or a Ted Bundy become... better people?

Malcolm McDowell as Alex DeLarge in Stanley Kubrick's 1971 film A Clockwork Orange. Public Domain.

Psychopaths have long captured the imagination. The names of famous psychopaths, such as Jeffrey Dahmer and Ted Bundy, evoke a morbid curiosity. The crimes committed by these men are so vicious, so unfathomably cruel, that it’s impossible to imagine how someone could do such a thing. The severed heads kept as mementos in Bundy’s apartment or the partially eaten body parts stowed away in Dahmer’s refrigerator are the result of simply inexplicable personalities. So it makes sense that the psychopath is often portrayed as cold-blooded and fearless, and, most of all, as a predator incapable of human emotion. However, research is growing to suggest that this might not be totally accurate.

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Have a Threshold for Disgusting Things? Find Out – Because It Reveals a Lot About You

How easily grossed out are you? Your sensitivity to disgust reveals more about you than you'd probably be comfortable with, from how you'll vote in this election to your potential to be a cold-blooded killer.

Who do you think has a stronger stomach: a liberal or a conservative? Who is the tougher party?

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