The curious character of cats

Crazy Cat

To some people, cats are the perfect pet. Intelligent, elegant, calming companions, capable of dealing with their own exercise and cleaning. To others, they are frustratingly independent, cool and aloof. So what is the true nature of the domestic cat?

Evolution in a test tube

Evolution test tube

Biologists have observed the evolution of a virus into two incipient species — a process known as speciation that Charles Darwin proposed to explain the branching in the tree of life, where one species splits into two distinct species during evolution.

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