Around the country park at the back of my house, there are several very tall trees (20m high plus) which have lost most of their leaves over the last few days. My daughter asked why the leaves on the top metre or so are still there, and I couldn't give her an answer. I don't even know what sort of trees they are, which is a pretty poor show I know. But why should the leaves on the most wind-blown part stay put the longest?
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