A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
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Cats recognise the voice of their owner, but never evolved to care.
22
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The cat brain weighs about 30g.
167