Fibonaccis talföljd och solceller

En smart 13-åring detta! Vad gjorde du när du var 13?

"I am the Lorax. I speak for the trees. I speak for the trees for they have no tongues."
—Dr. Seuss (The Lorax)

People see winter as a cold and gloomy time in nature. The days are short. Snow blankets the ground. Lakes and ponds freeze, and animals scurry to burrows to wait for spring. The rainbow of red, yellow and orange autumn leaves has been blown away by the wind turning trees into black skeletons that stretch bony fingers of branches into the sky. It seems like nature has disappeared.

But when I went on a winter hiking trip in the Catskill Mountains in New York, I noticed something strange about the shape of the tree branches. I thought trees were a mess of tangled branches, but I saw a pattern in the way the tree branches grew. I took photos of the branches on different types of trees, and the pattern became clearer.

http://www.amnh.org/nationalcenter/youngnaturalistawards/2011/aidan.html