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Grandma and grandpa didn't always have gray hair. Find out about what gives our hair color and what makes our hair lose that color as we get older.

Find out how scientists explain our yawns and use the graph to keep track of your family's yawns for a whole day!

Have you ever wondered why manhole covers are round? It's a good thing to know -- big companies sometimes ask that question in interviews.

Help your budding geologist learn about these common landforms in this worksheet on peninsulas and capes.