What is anthrax and could have the largest bioterrorism event in United States history been avoided? Many are not quite sure what anthrax is and what the 2001 attacks speculatively committed by Army scientist Bruce E. Ivins before he committed suicide were really about...

A new study introduces a valuable model system for investigating the role of synapse turnover in learning and memory in adult animals and elucidates mechanisms that link loss of existing synapses and the establishment of new synapses with improved learning.

Questions about origins of human warfare continue to generate interesting theories with little empirical evidence. One of the proposed explanations is sexual selection theory. Within and supportive of this theoretical framework, the authors demonstrate a mating–warring association among young heterosexual men in four experiments. Male, but not female, participants exposed to attractive, as compared to ...

Bottling up emotions can make people more aggressive, according to new research. The psychologists used a pair of classic movie scenes in their research. They found that subjects who were asked to suppress their emotions and show no reaction to a notoriously disgusting scene in the 1983 film "The Meaning of Life" and another in ...

Methadone has been used to treat heroin addicts for nearly 50 years. Yet we have surprisingly incomplete knowledge about possible harmful effects from prolonged use. New research shows that methadone affects the brain and impairs the attention of experimental animals.