Tori Hoehler presented two invited lectures during the past two weeks. The first, entitled, “Equating energy and biological potential” was presented at a symposium on deep biosphere sediment microbiology. The symposium was organized by the Dark Energy Biosphere Institute. The second talk, entitled, “Physicochemical characteristics and biological potential of aqueous environments beyond Earth” was presented at a Max Planck Symposium on Life Under Extreme Conditions. These symposia are held once a year to explore potential new directions for the Max Planck Gesellschaft, one of Germany’s premier science organizations. Hoehler had been invited to present an overview of astrobiology.