1 Earth Is a Hot Mess
Bill calls out climate change deniers, breaks down the science of global warming and explains how we can make the planet a cooler place to live.
★ 7.6 2 Tune Your Quack-o-Meter
Bill and his panel of experts debunk bogus alternative remedies like homeopathy, the healing power of magnets ... and curing cancer by yelling at it.
★ 6.7 3 Machines Take Over the World
From robots that paint Rembrandts to Twitterbots gone rogue, Bill and his guests explore the potential and pitfalls of artificial intelligence.
★ 9.0 4 More Food, Less Hype
Bill extracts DNA from a strawberry in the lab and talks about genetically modified foods with a Monsanto executive, a professor and a farmer.
★ 6.5 5 The Original Martian Invasion
Bill introduces the theory of panspermia, NASA scientists discuss the Mars 2020 mission, and Wil Wheaton and the panel ponder life on other planets.
★ 5.7 6 Do Some Shots, Save the World
With help from some friends in raincoats and a room full of unemployed germs, Bill demonstrates how vaccines work and why everyone needs to get them.
★ 6.0 7 Cheat Codes for Reality
Bill and his correspondents check out video game technology that's changing the world, including a game that helps surgeons sharpen their skills.
★ 7.5 8 This Diet Is Bananas
What's in a calorie? Bill flambés a marshmallow in the name of science, experts weigh in on fad diets, and singing kale keeps it real about nutrition.
★ 5.5 9 The Sexual Spectrum
Sex is complex! Bill explores the ever-evolving science of sexuality with help from a panel of experts and "Crazy Ex-Girlfriend" star Rachel Bloom.
★ 2.8 10 Saving the World -- with Space!
Bill and the panel discuss private space travel. Mean astronaut Joel McHale answers questions, and lunar gravity gives a young basketballer a boost.
★ 8.5 11 Malarkey!
Chemtrails. Crop circles. Palm readers. Bill takes aim at pseudoscience and explains how confirmation bias makes us believe things that aren't true.
★ 5.5 12 Designer Babies
Bill explores advances in IVF that are helping couples have healthy babies. "Project Runway" star Tim Gunn hosts a special fashion show in the lab.
★ 7.0 13 Earth's People Problem
Bill and his guests talk about tackling overpopulation by empowering women. Comedian Joanna Hausmann interviews couples about male contraception.
★ 7.0 
