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Why do people and animals get cancer more than they used to?

Why do people and animals get cancer more than they used to?  -Michael, Ceres, CA

Dear Michael,

A hundred years ago, human beings only lived to be about 50 years old. Now people are living longer, so there’s more time for cancer to develop in their bodies. That’s what I learned from my friend David Liu who researches cancer at Washington State University. » More …

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 …