Summary: Mars sure has a good poker face. If there's life on the planet, why haven't astronomers found it yet? We talk with a reporter from the magazine Scientific American who says: " The Search for Life on Mars Is about to Get Weird ." Also, we look at "the most mysterious star in the galaxy," called "Tabby's Star," and the theories as to why it might be dimming. Some say it's a sign of extraterrestrial life.
