# Bag of Wonder: A Day in Your Body > Wake up, eat breakfast, run and play, then sleep, and see what your body does inside all day. A free interactive 3D exhibit for children aged 2 to 6, from Curiosity's Child in Troy, Michigan. - Interactive exhibit: https://bagofwonder.com/look-inside/body/ - Ages: 2 to 6. The story is pitched at the youngest; the tap cards give older children more to chew on. - Cost: free, with no sign-in, no ads and no tracking. - Works on: phones, tablets and computers, in a web browser. Sound on for the narration. ## What it is Interactive 3D model of a young child's body. A time slider follows one day: sleeping while the brain stays busy, waking and stretching, breakfast traveling from the teeth down to the tummy and along the intestines, running with a faster heartbeat, the lungs puffing, and bones growing a tiny bit at night. A second slider pulls the body into a row: skin and clothes, muscles, the parts inside (brain, heart, lungs, tummy, liver, intestines) and the skeleton, with labels; tapping a part shows a child-friendly fact. How to play: press play to hear the story (read aloud in Kelly's voice, with the words on screen). Slide the time slider back and forth to see any part again. Slide "Pull apart" to see what is hidden inside. Tap any glowing button for a fact. ## The story 1. Shush. You are fast asleep. Your brain is busy all night, dreaming and tidying up. 2. Good morning! Your brain tells your eyes to open and your body to stretch. 3. Breakfast time! Your teeth chomp the food into tiny soft bits. 4. Gulp! The food slides down a tube to your tummy. 5. Your tummy squishes and mixes it, like a gentle washing machine. 6. Then the food goes on a long, wiggly journey, and your body keeps all the good bits to help you grow. 7. Run, run, run! Put your hand on your chest. Can you feel your heart going thump-thump faster? 8. Your lungs puff in and out, in and out, to bring you more air. 9. Bedtime. While you sleep, your bones grow a tiny bit taller. Goodnight, growing body! ## The parts, and what we tell children These are the tap cards, word for word. - **Skin**: Your skin is your body's biggest part! It keeps you cozy and safe, and it makes a fresh new outside layer about once a month. - **Muscles**: You have more than 600 muscles! They pull on your bones to make you jump, wave and smile. - **Brain**: Your brain is the boss of your body. By the time you are six, it is almost as big as a grown-up's! - **Heart**: Your heart is about the size of your fist. It beats more than 100,000 times every day, even while you sleep. - **Lungs**: Your two lungs fill up with air like soft balloons. The left one is a little smaller, to make room for your heart. - **Tummy**: Your tummy is a stretchy bag. It squishes your breakfast into a soft mush. - **Intestines**: These long tubes are folded up neatly inside you. Stretched out, they would be longer than your bed! - **Bones**: Babies have about 300 bones. Some join together as you grow, so grown-ups have 206. - **Skull**: Your skull is a strong helmet for your brain. When you were a baby, it had soft spots, so it had room to grow. - **Ribs**: You have 24 ribs. They make a cage that hugs your heart and lungs, and it moves when you breathe. - **Eyes**: Your eyes see the world upside down, and your brain flips the picture the right way up! - **Windpipe**: This tube carries air down to your lungs. It has rings, like a bendy straw. - **Food pipe**: This soft tube carries your food from your mouth down to your tummy. It squeezes the food along, so you can swallow even when you are lying down. - **Liver**: Your liver is a big, busy helper tucked under your ribs. It keeps some of the energy from your food safe for later. ## Getting the science right What we checked, and the myths we steer around: - The child is made with MakeHuman, its measured body shapes set to about five years old. The parts inside and the bones are real anatomy models (Z-Anatomy and BodyParts3D) of an adult, resized by hand to fit a child: no free source has real child anatomy, so the proportions inside are close but not exact. - Numbers on the cards: about 300 bones at birth (sources say 270 to 300) and 206 in grown-ups; 24 ribs (12 pairs); more than 600 muscles; a young child's heart beats about 80 to 120 times a minute, which is more than 100,000 times a day; the left lung is smaller (two lobes against three) to make room for the heart; a child's intestines are about 4 m or more, longer than a bed. - The brain never switches off at night: the story says it is busy all night, dreaming and tidying up, which is truer than "the brain switches on" in the morning. - Growing in sleep: growth hormone is mostly released in deep sleep, and you are very slightly taller in the morning. The caption says "a tiny bit", which keeps it honest. - The food's journey is simplified to one glowing bite: teeth, food pipe, tummy (it squishes and mixes), then a long trip through the intestines where the body keeps the good bits. It stops there, on purpose. - The organ colors are soft, gentle diagram colors, not real ones, with no blood, veins or wet shine. - Skin color: ten plain circles from the Monk Skin Tone Scale, all the same size, with no names or numbers and none chosen for you; the voice only says "Here you are!". - Gentle wording: always "you" and "your", never boy or girl; no blood, germs, hurt, poo or wee, no reproductive system or bladder, and no talk of good or bad food or weight. ## How to use it with children Choose a skin color together, then watch the day with the sound on. At the running stage, pause and put your hands on your chests to feel your hearts. Then pull yourself apart and tap the heart, the lungs and the tummy. Ask more than you tell, and let the child drive. Then step away from the screen: run on the spot for a minute, then feel your heartbeat and your breathing speed up. Measure your child against a door frame at bedtime and again first thing in the morning: you may find a tiny bit of extra height when they wake up. Trace around your child on a big sheet of paper and draw the tummy, heart and lungs inside. A few minutes together is plenty. The exhibit is a doorway to the real thing, not a replacement for it. ## Credits and licenses The real scans, maps and photographs belong to their makers, under the licenses below. The words, story and code are Curiosity's Child's. - The child is made with [MakeHuman](https://static.makehumancommunity.org/mpfb.html) (CC0): its measured body shapes set to about five years old, with MakeHuman's own skin, hair, eyebrows, eyelashes, eyes, t-shirt and trainers, posed in Blender. The parts inside and the bones are real anatomy models: [Z-Anatomy](https://www.z-anatomy.com/) by Gauthier Kervyn (CC BY-SA 4.0) and [BodyParts3D](https://dbarchive.biosciencedbc.jp/en/bodyparts3d/), © The Database Center for Life Science (CC BY-SA 2.1 Japan), resized to fit a child and recolored; our changed models are shared under the same license (CC BY-SA). Skin colors from the [Monk Skin Tone Scale](https://skintone.google/) by Dr Ellis Monk (CC BY 4.0). The bedroom, kitchen and park are watercolor paintings Kelly made for this page with Grok, and the table, chair, bowls, apples, plant, pot, grass, flowers and rubber duck are real models, all from [Poly Haven](https://polyhaven.com) (CC0). The bed is [Child bed 681](https://sketchfab.com/3d-models/child-bed-681-7b13b36ba2304912afc9840caea731c6) by [1-3D.com](https://sketchfab.com/1-3D.com) (CC BY-SA 4.0), resized, its sheet made into a duvet that tucks round you, with fresh bedding from Poly Haven's fabric scans (CC0); our changed bed is shared under the same license. The muscles are Z-Anatomy's real muscle models, fitted to the child and recolored (CC BY-SA). The shorts, teeth and the spoon are built in code. Narrated by Kelly, in her own voice. Real sounds of the day from Freesound ([CC0](https://creativecommons.org/publicdomain/zero/1.0/), thank you!): [quiet night, soft crickets](https://freesound.org/s/857163/) (Goldenboy76), [garden birds at 5 am](https://freesound.org/s/157848/) (matucha), [breakfast ambience](https://freesound.org/s/117601/) (mefrancis13), [distant children playing](https://freesound.org/s/274988/) (myserval). The music-box tune and the soft heartbeat are made for this page. ## About Bag of Wonder A free library of interactive 3D "look inside" science exhibits, made at Curiosity's Child, a licensed home daycare in Troy, Michigan. Secular and science-based; welcoming to all. - All exhibits and how we make them: https://bagofwonder.com/llms.txt - For grown-ups and AI assistants: https://bagofwonder.com/look-inside/about/ - To cite: "A Day in Your Body", Bag of Wonder, Curiosity's Child (Troy, Michigan). https://bagofwonder.com/look-inside/body/