Why do we age? – Ines, 17, Tunisia
melissamayerDear Ines,
I have gray fur. But sometimes I think it’s getting grayer—like my human friends’ hair does as they get older.
I asked my friend Jiyue Zhu about that. He’s a biochemist at Washington State University.
He told me it’s a mystery.
“We still don’t completely comprehend this,” Zhu said. “It’s an active area of research.”
Aging seems to be related to the way cells duplicate.
DNA is a set of instructions for making your body. You keep a copy of your DNA folded up inside each of your cells.
All those cells have different life spans. Some, like your skin cells, … » More …
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