Evolution of cooperation through cumulative reciprocity

Understanding reciprocal cooperation is a key element to understanding how people work together. Whether it is friends who exchange favors, animals who exchange food or services, or nations that coordinate their policies, ...

Cats distinguish between speech directed at them and humans

A small study has found that cats may change their behavior when they hear their owner's voice talking in a tone directed to them, the cats, but not when hearing the voice of a stranger or their owner's voice directed at ...

Protecting very old trees can help mitigate climate change

Ancient trees—those that are many hundreds, or even thousands, of years old—play a vital role in biodiversity and ecosystem preservation by providing stability, strength, and protection to at-risk environments. In a review ...

Genomic analysis reveals true origin of South America's canids

South America has more canid species than any place on Earth, and a surprising new UCLA-led genomic analysis shows that all these doglike animals evolved from a single species that entered the continent just 3.5 million to ...

Understanding how a cell becomes a person, with math

We all start from a single cell, the fertilized egg. From this cell, through a process involving cell division, cell differentiation and cell death a human being takes shape, ultimately made up of over 37 trillion cells across ...

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