What does water smell like? Did bipedal dinosaurs get back pain? Is my perception of time related to my heart rate? Does getting fresh air when you're sick actually doing anything? Are orange peels airtight? Why can't I smell ants? Why can't humans drink river water anymore? Deboki Chakravarti and Hank Green have answers!

If you're in need of dubious advice, email us at [email protected].

Join us for monthly livestreams and an exclusive weekly podcast at patreon.com/dearhankandjohn.

Follow us on Twitter! twitter.com/dearhankandjohn

If you're in need of dubious advice, email us at [email protected].

Join us for monthly livestreams at patreon.com/dearhankandjohn.

Follow us on Twitter! twitter.com/dearhankandjohn

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.