Why do we feel the urge to yawn just by seeing or hearing someone else do it? Do animals yawn? Why do we yawn when bored or tired? Is the oxygen explanation a myth? Why does everything sound muffled when I yawn? Why do I tear up when I yawn?

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Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: rhapsodysparkles, stonefan, fireindeedhot, sleozz, leafmeb, greshirtbrownguy, duzzeno and fendrbud

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Why were the Olympics so strict about amateurism in the first place? Why were professionals not allowed initially? Who was disqualified for being a professional? How did the lines between amateur and professional blur? Are there any sports left in the Olympics that still maintain that strict amateur status?

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Why should we ‘eject’ before physically removing a USB device? Who came up with the idea of USB in the first place? What is ‘juice jacking’ and why do we need to watch out for it?

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Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: perkovic15, nmxt, admiralakbar1, thezhoumustgoon, dcsantonio, imlagginghelp, tstack123, intanetto, ddbaby, peppercakerinkiki and tbf16

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What causes a sore throat? Why is it that alcohol, which is a disinfectant, doesn’t cure a sore throat? Why is honey a popular remedy? Explain the science behind the "lump in your throat" feeling. Did George Washington die of a sore throat?

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What exactly is a Dyson Sphere? What materials would be required? What is a Dyson Swarm and a Dyson Bubble? Could any other civilizations have built a dyson sphere already?

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Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: apprehensivemedia999, loki-l, kriss3d and joushmark

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How does collagen differ from other proteins? What are the different types of collagen? Is there a way to slow down collagen loss as we age? What is the relationship between collagen and gelatin?

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Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: leosar, kkl81, leg3ndwaitforitdary, thehealadin, yet_md, diffyqgirl, catortle- and jorhiru

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Why is the Mona Lisa the most famous painting in the world when many other paintings are technically harder? How was it stolen? Who is Lisa? What is so captivating about her smile? What happened to Louvre visitor numbers after the painting was stolen?

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Is there a nutritional difference between frozen and fresh blueberries? Why do some blueberries taste sweet while others are tart? How are blueberries cultivated, and what are the different types? Does the "blue raspberry" exist? What is Bluetooth’s connection to blueberries?

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Why has the three body problem been puzzling mathematicians for centuries? What is a real world example? What is its connection to chaos theory? Who wrote the famous fiction novel? Is there really any solar system out there like described in the book and Netflix series?

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How did we go from secret handshakes to digital codes? Explain “something you know, something you have, and something you are”. Where was the first computer password invented? Why are SMS codes considered not that secure? Which former CIA director had their phone compromised via a teenage phone hack?

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