Dr. Luisa Rebull returns to the show to describe new research with the Kepler space telescope. Her ingenious study takes advantage of Kepler's strengths, and has produced results that stump theorists. Dr. Rebull explains why this data has given her "a whole new appreciation for post office workers."
Dr. Sebastiano Padovan talks about the planet closest to the sun, Mercury. He compares the evolution of planets to movies, and says that understanding a planet's history from its current state is like trying to figure out the plot of an entire movie from a single snapshot. He also explains why Mercury is "a favorite" of scientists who do computational modeling.