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How do I have a bake sale?

Dr. Universe,

How do you have a bake sale?

-Aoife, 7, Omagh, Ireland

Dear Aoife,

It took more than a hundred bakers to pull off the biggest bake sale in history. They made 14,534 cakes, sold out their supply in eight hours, and made it into the Guinness World Records. » More …

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 are ripe fruits sweet?

Why are ripe fruits sweet and why is it so important?  -Alexa, Schenzhen, China

Dear Alexa,

My friend Kate Evans said the answer really depends on whether you want the perspective of a person, a plant, or even a cat. Evans is a plant scientist at Washington State University in Wenatchee, where she investigates fruit in the Apple Capital of the World.

She explained how long ago, wild apples actually grew in forests. Without farmers around to plant them in orchards, trees had to scatter their own seeds to survive.

For some trees, the key to survival is growing sweet, ripe fruit. » More …