Cooperativeness among genetically unrelated humans remains a major puzzle in the social sciences. We explore the causal impact of physical distance on willingness to help. In a field setting, participants decide about supporting local refugees at the dispense of money to themselves. We vary...

Parochial altruism – individual sacrifice to benefit the in-group and harm an out-group –undermines inter-group cooperation and is implicated in a plethora of politically-significant behaviors. We report experimental evidence about the impact of variation in social distance within the...

A detailed microstructural characterization of the AlMo0.5NbTa0.5TiZr refractory alloy in the as-cast state is reported for first time, showing a dendritic structure, with a mixture of A2/B2 phases in both the dendritic region and in the transition towards interdendritic regions. A phase rich in...