Diversity in the brain - How millions of neurons become unique

Many wild and cultivated plants arise through the combination of two different species. The genome of these so-called polyploid species often consists of a quadruple set of chromosomes - a double set for each parental species - and thus has about twice as many genes as the original species.

Pain-relieving actions by other people trigger a learning effect in the brain which reduces pain. A new study led by the University of Zurich shows that pain relief is more effective when it is provided by a stranger.