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No case is on \textbf{record} of a variable being ceasing to be variable under cultivation. Our oldest cultivated plants, such as wheat \cite{Darwin_1900}, still often yield new varieties: our oldest domesticated animals are still capable of rapid \textit{improvement or modification} \copyright . \copyright.  \begin{quote}  The trouble with quotes on the Internet is that you never know if they are genuine. —Albert Einstein  \end{quote}