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\begin{frame}
  \frametitle{Motivation and Overview}

  \scalebox{.8}{
  \begin{tikzpicture}[default]
    \def\diax{\text{time}}
    \def\diay{\text{speed}}
    \def\diaborderx{.75cm}
    \def\diabordery{.75cm}
    \diagram[1]{-1}{4}{-1}{8}{1}
    \diagramannotatez
    \diagramannotatexx{1/1h,2/2h,3/3h}
    \diagramannotateyy{1/10 \text{mph},2/20 \text{mph},3/30 \text{mph},3/30 \text{mph}}
    \draw[cred] plot[smooth,domain=0:3,samples=20] (\x,{1});
    
    \onslide<2->{ \draw[draw=none,fill=cred,opacity=.5] plot[ybar interval,domain=0:1,samples=2] (\x,{1}); }
    \onslide<3->{ \draw[draw=none,fill=cred,opacity=.5] plot[ybar interval,domain=1:2,samples=2] (\x,{1}); }
    \onslide<4->{ \draw[draw=none,fill=cred,opacity=.5] plot[ybar interval,domain=2:3,samples=2] (\x,{1}); }

    \begin{scope}[xshift=.65\textwidth]
      \def\diax{\text{time}}
      \def\diay{\text{distance}}
      \def\diaborderx{.75cm}
      \def\diabordery{.75cm}
      \diagram[1]{-1}{4}{-1}{8}{1}
      \diagramannotatez
      \diagramannotatexx{1/1h,2/2h,3/3h}
      \diagramannotateyy{1/10 \text{mi},2/20 \text{mi},3/30 \text{mi},4/40 \text{mi},5/50 \text{mi},6/60 \text{mi},7/70 \text{mi}}
      \pause
      \node[cred,include] at (1,1) {};
      \pause
      \node[cred,include] at (2,2) {};
      \pause
      \node[cred,include] at (3,3) {};
      \pause
      \draw[cred] plot[smooth,domain=0:3,samples=20] (\x,{\x});
    \end{scope}
  \end{tikzpicture}
  }
\end{frame}