The role of third parties like the UN in resolving conflicts appears to have deep evolutionary roots.

Different species of butterflies speed up the evolution of biodiversity by interbreeding so they can share genes for protective wing patterns.

The striking conclusion from this argument is that older people, even those coming from populations that have practiced agriculture for millennia, may suffer adverse health effects from the agricultural diet, despite having no problems when they were younger.

Falcons pose an evolutionary puzzle. Crucial varieties of disease-fighting genes missing among the far-ranging predators.