Science Rules! with Bill Nye

When it comes to things that give us the heebie-jeebies, parasites reign supreme. But according to this week's guest, ecosystems couldn't exist without them. Chelsea Wood explains what makes them so creepy, how to prevent them from killing us, and why she keeps digging around in decades-old cans of salmon.

It turns out being happy, or becoming happier is possible with a bit of effort. We’re joined by happiness expert and host of The Happiness Lab, Dr. Laurie Santos to talk about her research into human happiness and to take your calls, including one from Mike from Colorado who asks, “Is there a genetic component to happiness?”

It’s a highly controversial and unlikely hypothesis. But, as Dr. David Relman explains, we can't rule it out, because we still don't know the original source of the SARS-CoV-2 virus.

Harold McGee changed the culinary world in the ’80s with his book on the science of cooking. His new book moves up the face to the nose, breaking down the molecules that make up all the smells around us. He explains why some scents echo each other, how dogs can sniff out cancer, and what happens when a coronavirus takes away your sense of smell.

The chemicals we rely on for practically everything are slowly threatening our health, happiness, and the future of our species. Dr. Shanna Swan walks us through the evidence.