Emerging into the terminal is usually straightforward, though recently in Rwanda I was asked, with a winning smile, if I wouldn't mind waiting outside under an acacia tree while they stamped my passport as there were too many steps up into the terminal.

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"My family hasn't sat under the same oak tree for the last 500 years, " he said.

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For example, by far the most famous tree scientist of modern times operates out of Hsu (Humboldt State University) in an endowed chair under my name and money.

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