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\begin{frame}{Alan Turing}
  \begin{center}
    \includegraphics[height=.5\textwidth]{Turing-1.jpg}
    \hspace{.5cm}
    \includegraphics[height=.5\textwidth]{Turing-2.jpg} \\[1.5ex]
    \emph{Alan Mathison Turing (1912--1954)}
  \end{center}
\end{frame}