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Why do we get jealous?

Why do we get jealousy? I can feel it sometimes, too, but I don’t know why.  -Hailey, 10, London, Ontario

Dear Hailey,

Cats love attention, but we don’t get jealous like humans do. It’s one of those emotions that set human beings apart from other creatures in the animal kingdom. But I can’t imagine it’s the most pleasant. The poet William Shakespeare once called jealousy a green-eyed monster. Still, it’s an emotion that can help you navigate the world.   » More …