Although there is ample support for the causal link between home visit parenting programs and child development outcomes, few studies have explored what it is that drives this relationship – to what extent home visit programs are implemented as designed in terms of the content and strategies...

There is continuing debate about what explains cooperation and self-sacrifice in nature and in particular in humans. This paper suggests a new way to think about this famous problem. I argue that, for an evolutionary biologist as well as a quantitative social scientist, the triangle of two...