We've done it to ourselves and to man's best friend — researchers have found microplastics in human and canine testes. (Allen J. Schaben / Los Angeles Times) Researchers have located one more ...

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If one of your testicles is slightly bigger than the other, don’t panic, this is completely normal for most men and boys. The human body is not perfectly symmetrical, which means that many body parts, ...

If we look across the whole of the mammal branch of the tree of life, we find there are many groups of mammals that have ...