The puzzling ability of people to switch from intense love to deep hatred has prompted fascinating research
Anti-social behaviour online - trolling, cyberbullying - is a growing concerning phenomenon but research shows ignoring these mostly faceless angry attention-seekers could be the best response.
Violent lone wolf extremists are looking for acknowledgment and attention as they feel overlooked, aggrieved and insignificant.
Dominance and control through many forms of abuse is an unfortunately common and destructive force in many relationships.
In high-risk occupations, leaders can protect the health of their staff by promoting certain behaviours like getting enough sleep, dealing with grief or talking up about stress.
Most people don’t join violent extremist groups for ideological reasons. Instead, they join for social reasons – with someone they know, to connect with other people or to find a sense of purpose.
Governments, police and the wider society often struggle to understand, control and prevent anti-social behaviour. Psychology has some of the answers.
Anger and aggression are normal human emotions that play an important role at times but can cause problems if they become uncontrollable and lead to violence.