\[
\begin{array}{|c|c|}
\hline \text{the volume of water in a tall glass} & 0.5 \, \text{L} \\
\hline \text{the length of a high-school swimming pool} & 25 \, \text{m} \\
\hline \text{the mass of a US penny} & 2.5 \, \text{g} \\
\hline \text{the world record for the 100 m freestyle swim} & 44.9 \, \text{s} \\
\hline
\end{array}
\]
\[
\boxed{
\begin{array}{|c|c|}
\hline \text{the volume of water in a tall glass} & 0.5 \, \text{L} \\
\hline \text{the length of a high-school swimming pool} & 25 \, \text{m} \\
\hline \text{the mass of a US penny} & 2.5 \, \text{g} \\
\hline \text{the world record for the 100 m freestyle swim} & 44.9 \, \text{s} \\
\hline
\end{array}
}
\]