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Smile with Daniel

Smile with Daniel

Every night, Daniel asks his mom a question.Why do we call money "bucks"? Why do we get dizzy when we spin? Why do we knock on wood?The answers are always surprising, and a lot more interesting than you"d expect.Smile with Daniel is a short podcast for curious kids and the adults who love them.Real questions. Real answers. No dumbing it down.New episodes every week.Find us @smilewithDaniel everywhere.

kids & family education for kids

All Episodes

13:17

Why Did Ebola Terrify the World?

Smile with Daniel ·

2026/08/04

Daniel heard someone say the word Ebola at school. The room went quiet.He wants to know why.The answer turns out to be more complicated than most people expect. Because lots of diseases kill people. Measles kills hundreds of thousands every year. Tuberculosis kills over a million. Yet those names don't make a room go quiet the way Ebola does. So the fear was never just about the numbers.Here is what Ebola actually is. It is a virus first identified in 1976 near the Ebola River in what is now the

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10:42

One in Four Animals Is a Beetle... And Here's Why

Smile with Daniel ·

2026/08/04

Daniel spots a beetle outside and asks why he seems to see them everywhere.The answer is more remarkable than he expected.There are around four hundred thousand known species of beetles -- roughly one in four of all known animal species on Earth. Only several thousand mammal species are known. Roughly eleven thousand bird species. Even mammals, birds, and reptiles combined don't come close to beetles. And scientists describe thousands of new beetle species every year. The true number is likely much

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6:44

A Deck of Cards. More Arrangements Than Atoms in a...

Smile with Daniel ·

2026/08/04

Mom asks Daniel how many ways a deck of cards could be arranged before they start playing.He says millions.The answer is about eight followed by sixty-seven zeros.That number -- 52 factorial, written in mathematics as 52 with an exclamation mark -- is what you get when you multiply 52 by 51 by 50, all the way down to one. Every card you place narrows the options. Every choice multiplies the possibilities. And the result is a number so large it is on roughly the same scale as estimates for the number

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6:52

A Diamond is Forever. And That Was the Plan

Smile with Daniel ·

2026/08/03

Daniel wants to know why diamonds are so expensive.The answer has less to do with geology than most people think.Diamonds are not as rare as their price suggests. Gem-quality diamonds are genuinely uncommon, but the gap between what diamonds cost to mine and what they sell for has long been shaped by something else: controlled supply. A company called De Beers, founded in South Africa in 1888, eventually controlled roughly eighty-five percent of the world's diamond supply. Once you control most of

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6:30

A Merchant's Mistake Changed How the World Makes Tea

Smile with Daniel ·

2026/08/02

Mom asks Daniel how the tea bag was invented.He says some British person, very carefully, with a lot of thought about the perfect cup of tea.He is wrong on almost every count.It was a New York merchant. In 1908. By complete accident.Thomas Sullivan was trying to save money on sending tea samples to his customers. Instead of metal tins, he packaged small amounts of tea in little silk pouches tied with thread. His plan was for customers to open the pouch, empty the tea into a pot, and brew it

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6:36

Why Do Japanese Kids Clean Their Own Schools?

Smile with Daniel ·

2026/08/01

Mom asks Daniel what he would think if students cleaned their own school every day. Classrooms, hallways, toilets -- all of it.He says that sounds like a punishment.He is almost exactly wrong.In Japan, school cleaning -- o-soji -- is an established part of school life, not an optional activity and not a punishment. At a scheduled time each day, the whole school stops. In many schools, a short piece of music plays over the speakers to signal cleaning time. Every student, from first grade through high

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7:03

How Can Birds Change Their Songs in Cities?

Smile with Daniel ·

2026/07/30

Mom asks Daniel if he thinks city birds sound different from birds in the countryside.He says a bird is a bird. They all make the same sounds.He is wrong -- and the science behind why is one of the most quietly remarkable things happening in cities right now.Researchers studying great tits -- a small songbird found across Europe -- compared their songs in ten major cities including London, Paris, Prague, and Amsterdam with songs from birds of the same species in nearby forests. In each of the ten

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6:43

Why Did the Eiffel Tower Almost Never Exist?

Smile with Daniel ·

2026/07/29

Daniel looks at a photo of Paris and says he cannot imagine the city without the Eiffel Tower.Mom tells him it almost wasn't there.When Gustave Eiffel announced plans for his iron tower in 1887, some of the most celebrated writers, artists, and architects in France were furious. They published a letter in a major Paris newspaper calling it a gigantic black smokestack, a blight on Paris, and a truly tragic street lamp. Guy de Maupassant -- one of France's most famous writers -- called it an eyesore

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5:35

Antarctica Means Opposite the Bear. There Are No...

Smile with Daniel ·

2026/07/29

Daniel wants to know why there are no polar bears in Antarctica.The answer starts with what the word Antarctica actually means.Opposite the bear.The ancient Greeks had a word for the northern polar region: arktos, meaning bear. Not because of polar bears -- they had never seen one. Because of the constellation Ursa Major, the Great Bear, which dominates the northern sky and was always visible to ancient observers looking north. The land under that constellation became Arktos. The Arctic.The Greeks

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6:36

Before Alarm Clocks, Someone Shot Peas at Your Window

Smile with Daniel ·

2026/07/29

Mom asks Daniel how people woke up for work before alarm clocks existed.He guesses roosters. The sun. Someone banging on the door.That last one. Literally.From roughly the 1800s through the 1940s in industrial Britain and Ireland, there was an entire profession called knocker-uppers. People paid them a few pence a week to walk the streets before dawn and knock on their windows until they got out of bed. They used long bamboo poles to reach upper floors. Rattles. Soft hammers. And in some cases --

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6:43

Could All the Internet Weigh Less Than a Strawberry?

Smile with Daniel ·

2026/07/28

Mom asks Daniel a riddle. If you could put all the information on the internet on a scale -- every photo, video, message, and website -- how much would it weigh?He says tons.Some physicists have estimated it could weigh roughly as much as a strawberry. And the reason why is one of the most mind-bending things about how computers actually work.Everything stored on a computer is ultimately represented as ones and zeros. Those ones and zeros have to be physically encoded somewhere inside the machine

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6:23

The Smell of Rain Has a Name. So Does the Science...

Smile with Daniel ·

2026/07/28

Daniel smells rain coming through the window and asks why. Rain is just water. Water doesn't have a smell. So what is he actually smelling?At least three things. And none of them are the rain itself.The main one has a name: petrichor. Coined in 1964 by two Australian scientists -- Isabel Joy Bear and Richard Thomas -- who published a paper in the journal Nature. They built the word from two Greek words. Petra, meaning stone. And ichor -- the fluid that flows in the veins of the gods in Greek

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6:05

Why Do Dogs Kick After Pooping? It Is Not What You...

Smile with Daniel ·

2026/07/25

Mom watches the family dog kick the grass after pooping and asks Daniel why he thinks she does it.He is confident. She is covering it up. Like cats do.He is wrong -- in the best possible way.Dogs kick after pooping not to hide the evidence but to spread it. When a dog scratches the ground after defecating, glands in her paws release chemical signals. So instead of one scent in one location, the dog is now broadcasting two signals over a wider area. The poop says she was here. The paw scent spreads

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6:34

Everyone Knows the 5-Second Rule. Almost Nobody Checked.

Smile with Daniel ·

2026/07/25

Daniel drops his fruit bar on the floor and picks it up.He invokes the five-second rule.Mom takes it away.The five-second rule says that if you pick up dropped food fast enough, it is safe to eat -- because bacteria need time to transfer from the floor to your food. Get there in under five seconds and you win.In 2016, a food scientist named Donald Schaffner at Rutgers University decided to actually test it. His team dropped food onto contaminated surfaces thousands of times, measuring bacterial

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8:40

The Seven Wonders of the World: Who Actually Decided?

Smile with Daniel ·

2026/07/24

Daniel wants to know what the Seven Wonders of the World are. And who decided.The answer is more complicated than he expected.There is no single official list. There are many -- but the two that people usually mean are the ancient Seven Wonders and a modern list announced in 2007. And the stories of how each was created could not be more different.The ancient list.More than two thousand years ago, Greek writers around the Mediterranean began compiling lists of extraordinary sights -- almost like

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8:21

How Do Roblox and Minecraft Actually Work?

Smile with Daniel ·

2026/07/24

Daniel plays Roblox and Minecraft almost every day. Mom asks if he actually knows what is happening inside the computer.He doesn't. Neither do most people.Both games look similar from the outside -- blocks, building, other players. But underneath they work in very different ways. And understanding the difference reveals something fascinating about how games and software work in general.Start with what both games have in common. When you press a button or move your character, your device runs code

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5:44

How Do Painkillers Know Where Your Pain Is?

Smile with Daniel ·

2026/07/23

Daniel had a headache. Mom gave him Advil. The headache went away.So he asked the obvious question. How did the Advil know to go to his head?It didn't.When you swallow ibuprofen, it dissolves in your stomach, gets absorbed into your bloodstream, and your bloodstream carries it all around your body. Your feet get Advil. Your elbows get Advil. Your fingernails get Advil. Your body doesn't know where the medicine is needed. It just lets the bloodstream deliver it everywhere.The headache went away

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10:14

How Does Anesthesia Work?

Smile with Daniel ·

2026/07/21

Daniel's friend had surgery last week. One second the doctor was counting down. The next second he was waking up. Hours had passed. He remembered none of it.Daniel wants to know what actually happened in between.The answer starts with a correction most people need. General anesthesia is not ordinary sleep. Sleep is a natural, reversible brain state. Anesthesia is a drug-controlled state designed to make you unconscious, unaware of the operation, and unable to remember it afterward. For most people,

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8:11

Snow Isn't White. Here's What's Actually Happening.

Smile with Daniel ·

2026/07/21

Daniel looks out the window at snow and asks why it's white. Water isn't white. Ice isn't really white. So why is snow?The answer starts with a correction.A single ice crystal is transparent. See-through, like glass. Light passes right through it. So a snowflake -- which is essentially a tiny, complex ice crystal -- isn't white either.But when millions of them pile up together, something happens. Light enters the snow, hits a surface, and bounces. Then hits another surface, and bounces again. And

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8:06

The Science Behind Noise Cancelling Headphone

Smile with Daniel ·

2026/07/21

Daniel put on his noise cancelling headphones on a plane and the engine noise just disappeared.He assumed it was thick padding blocking the sound.He was wrong -- in a really interesting way.Noise cancelling headphones do not block sound. They create more sound. And that new sound cancels the old sound out. You fight sound with more sound.Here is how it works.Sound travels in waves -- peaks and troughs repeating over and over. If you take two identical waves and line them up so peaks match peaks, the

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