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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 …

How do I make a diary?

How do I make a diary?  -Nimra, Kitchener, Ontario

Dear Diary,

Oh, I mean…Dear Nimra,

Making a diary is like creating your own top-secret book. So, I headed straight for a Washington State University library where there are more than a million books.

My friend Linnea Nelson was working with some of the books from the special collections when I went to visit her in the lab. She is a conservator, so part of her job is to repair and re-build old books. It preserves their history.

Some of the books had an old smell that wafted up into my little nose. The smell comes from different chemical compounds that escape into the air, including one similar to vanilla. The compounds are in the ink, paper, and other materials used to keep the pages together. And one way to keep the pages together is to bind them with thread.  » More …

Bug hearts and ganglia

Take a look inside a bug and you’ll find one brain in its head and other little brains called “ganglia” along its whole body. These tiny control centers help insects see, taste, and smell. They also help them quickly escape threats, like other bugs.

“If you had little brains everywhere else, you would also be much quicker,” says bug expert Laura Lavine. » More ...