Answers to readers’ questions

I get lots of emails asking questions that don’t warrant an entire column. Here are a few of the most interesting I’ve received recently.
Do trees have heart attacks?
People have a heart and trees have heartwood.
So do trees have heart attacks? Not exactly.
Trees don’t have a pumping heart, but their heartwood does decay, causing eventual structural failure.
Both trees and people have vascular and respiratory systems, but the functionality is different.
A human being&rsq...

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