PLUS (MT)

8:00 pm 

Scientific American Frontiers  "Alien Invasion"  This program explores the impact that invasive species and viruses have on environmental and human health around the world. Increasingly, foreign animal and plant species jump national and international boundaries and wreak havoc on ecosystems that offer no natural resistance or predators to the unwelcome guests. Alda looks at some of the most egregious aliens and what's being done to control them. D

9:00 pm 

Pleasure and Pain   With his customary wit and wisdom, Michael Mosley looks at the fascinating worlds of pleasure and pain. Teasing out the precise neural circuitry that allows us to experience pleasure, Mosley discovers how pleasure is at the root of our ability to make sense of the world, and how it reinforces healthy behaviors such as eating, having sex and keeping warm.G

10:00 pm 

NOVA  "Deadliest Tornadoes"  NOVA examines tornado science in the wake of April 2011's outbreak of deadly winds that leave a trail of destruction and kill more than 360 people. While meeting with victims and scientists, the program looks at possible improvements in tornado prediction and ways to better protect people and communities.G

11:00 pm 

America Revealed  "Food Machine"  Survivor winner, technology expert and communications attorney Yul Kwon is on a cross-country journey to discover the infrastructure that underpins modern life. He first explores how this machine feeds nearly 300 million Americans daily by riding along on a New York City pizza delivery route and then skydiving into California's Central Valley. He meets industrial and urban farmers, crop dusting pilots, long-distance bee truckers and modern cowboys. Part 1 of 4G