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How do you think you find out how old a tree is? When a tree has been cut down, you can count its "rings" in order to tell how old it is, but what about when it is alive? We can't ask a tree how old it is. But there is a way! This activity will teach you and your child a way to estimate the age of a tree without cutting it down. It doesn't work with every tree but it will with a lot of them.

How Old is That Tree?

education.com

Apparently oranges burn like candles. No messy wax, and no wick required. Definitely trying this.