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Bones: How are they made?

How are bones made? -Oscar, 10

Dear Oscar,

A couple months before you were born, your skeleton was soft and bendy. It was made out of cartilage, the same material that’s in your nose and ears now. But when certain cells in your body called osteoblasts and osteoclasts began to work together, new bone started to form. » More …

How are magnets made?

Dr. Universe, How are magnets made-Andrea, 8, Berkeley, CA                                                                                     

Dear Andrea,

When I saw your question, I headed straight for the Magnetics Lab and met up with my friend John McCloy. I found out the word “magnet” comes from a Greek word for the region of modern-day Turkey we once called Magnesia. That’s where people found magnets in nature. » More …