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SMILES were developed by ancient humans as a way to attract less-aggressive mates, according to a new study.

A team of scientists is claiming that the kindness humans can show via facial expressions (biểu lộ nét mặt) was a key factor in our evolution (tiến hóa).

They focused on genetic samples from Neanderthals, which showed that gene mutations may have led humans to “self-select less aggressive mating partners”.

They added that this led to 'self domestication'.

This term is usually used to describe the process of wild animals adapting to life living with humans without direct selective breeding.

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