Oct. 28, 2018, 2:07 p.m.
tutti - social network
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Se ha perdido un hombre en Vitoria hace unas horas. Por favor necesitamos ayuda
Researchers have shown for the first time in an experiment that also non-human animals exchange different kind of favors. Humans commonly trade different commodities, which is considered a core competence of our species. However, this capacity is not exclusively human as Norway rats exchange different commodities, too. They strictly follow the principle "tit for tat" -- even when paying with different currencies, such as grooming or food provisioning.https://www.sciencedaily.com/releases/2018/02/180201173109.htm
An acoustic listening device used by the Dutch army for hearing enemy airplanes, between World War I and II.
