\frame { \frametitle{Covers}
 \hspace{0cm}\includegraphics[height=3.5cm]{covers/ACMCommunications}
 \hspace{1cm}\includegraphics[height=3.5cm]{covers/FutureTechPhysCosm}
 \hspace{1cm}\includegraphics[height=3.5cm]{covers/Gravity}\\\vspace{-1.5cm}
 \hspace{1cm}\includegraphics[height=3.5cm]{covers/max-planck-research2}
 \hspace{1cm}\includegraphics[height=3.5cm]{covers/nsffy2006budgetcover}
 \hspace{1cm}\includegraphics[height=3.5cm]{covers/mmcover}\\\vspace{-1.5cm}
 \hspace{2cm}\includegraphics[height=3.5cm]{covers/visprocessingtensor}
 \hspace{1.5cm}\includegraphics[height=3.5cm]{covers/PetascaleComputingBook}
 \hspace{1cm}\includegraphics[height=3.5cm]{covers/NR689}
}