Why do Americans tip so much? What happened when Angie eliminated grading in a college course? And why did almost every pay toilet in the U.S.A. vanish between 1970 and 1980?

103. Should Toilets Be Free?

Research psychologist Angela Duckworth (author of "Grit") and tech and sports executive Mike Maughan really like to ask people questions, and they believe there’s no such thing as a stupid one. So they have a podcast where they can ask each other as many “stupid questions” as they want. New episodes each week. "No Stupid Questions" is a production of the Freakonomics Radio Network.

Join the Freakonomics Radio Plus membership program for weekly member-only episodes of Freakonomics Radio. You’ll also get every show in our network without ads. To sign up, visit our show page on Apple Podcasts or go to freakonomics.com/plus.

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Is there any upside to negative emotions? What can comedians teach us about dealing with pain? And why did Angela eat off of a stranger’s plate at a sushi bar?

196. What’s Wrong With Being a Little Neurotic?

Where is the line between a good guy and a doormat? Do people with sharp elbows make more money? And why did Angela’s mother give away her birthday present?
Take the Big Five inventory: freakonomics.com/bigfive

195. Can You Be Too Nice?

What’s the difference between being introverted and being shy? What are extroverts so cheerful about? And does Angela’s social battery ever run out?
Take the Big Five inventory: freakonomics.com/bigfive

194. Is It Okay to Be an Introvert?

Is it really that important to make your bed? What’s the benefit of hiring a lazy person? And how many cups of spinach can Mike fit in a red Solo cup?  
Take the Big Five inventory: freakonomics.com/bigfive

193. Are You as Conscientious as You Think You Are?

What do the most creative people have in common?  How open-minded are you, really? And what’s wrong with ordering eggs Benedict? 
Take the Big Five inventory: freakonomics.com/bigfive

103. Should Toilets Be Free?

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