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Kids' Big Questions

Big Questions, Complete Answers

The "why" questions kids actually ask, answered all the way down in short, clear lessons, each ending with the complete answer instead of a new question.

157 lessons ~9 h

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Who it's for

Kids roughly 6 to 12, or a grown-up reading alongside them.

Unit 1

Animals

35 lessons · 118 min

  1. 1 Why Don't Earthworms Get Crushed Underground? 3 min Start
  2. 2 Why Don't Fish Drown? 5 min Start
  3. 3 How Do Birds Fly? 3 min Start
  4. 4 Why Don't Spiders Stick to Their Own Webs? 3 min Start
  5. 5 How Do Cats Land on Their Feet? 3 min Start
  6. 6 Why Do Dogs Sniff Everything? 3 min Start
  7. 7 How Do Bees Make Honey? 3 min Start
  8. 8 Where Do Frogs Go in the Winter? 3 min Start
  9. 9 Why Do Geese Fly in a V? 3 min Start
  10. 10 How Do Flies Walk Upside Down on the Ceiling? 4 min Start
  11. 11 If People Came from Monkeys, Why Are There Still Monkeys? 4 min Start
  12. 12 How Do Bats Find Their Way in the Dark? 4 min Start
  13. 13 How Do Fireflies Light Up? 3 min Start
  14. 14 How Does a Caterpillar Turn into a Butterfly? 4 min Start
  15. 15 How Can Owls Turn Their Heads So Far? 4 min Start
  16. 16 How Do Squirrels Find Their Buried Nuts? 3 min Start
  17. 17 How Can Bears Sleep All Winter Without Eating? 3 min Start
  18. 18 How Do Spiders Make Silk? 3 min Start
  19. 19 Why Do Mosquitoes Bite? 3 min Start
  20. 20 Why Do Birds Sing? 3 min Start
  21. 21 Why Do Zebras Have Stripes? 3 min Start
  22. 22 Why Do Dogs Wag Their Tails? 3 min Start
  23. 23 How Do Ants Find Their Way? 3 min Start
  24. 24 Why Do Snakes Shed Their Skin? 3 min Start
  25. 25 How Do Chameleons Change Color? 3 min Start
  26. 26 How Do Penguins Stay Warm? 3 min Start
  27. 27 Why Do Cows Chew All Day? 3 min Start
  28. 28 How Do Beavers Build Dams? 3 min Start
  29. 29 Do Fish Sleep? 3 min Start
  30. 30 Why Do Cats Purr? 4 min Start
  31. 31 Why Don't Woodpeckers Get Headaches? 3 min Start
  32. 32 Why Do Cats' Eyes Glow in the Dark? 4 min Start
  33. 33 How Do Birds Know Where to Fly for the Winter? 4 min Start
  34. 34 Why Do Cats Have Whiskers? 5 min Start
  35. 35 How Do Snakes Move Without Legs? 4 min Start
Unit 2

Plants

19 lessons · 64 min

  1. 1 Why Are Plants Green? 3 min Start
  2. 2 How Does a Tree Drink Water? 3 min Start
  3. 3 How Does a Seed Know Which Way Is Up? 3 min Start
  4. 4 Why Do Leaves Change Color in Fall? 3 min Start
  5. 5 Why Does Cutting an Onion Make You Cry? 3 min Start
  6. 6 If a Tree Is Alive, Why Doesn't It Scream When We Cut It? 4 min Start
  7. 7 Why Does a Cut Apple Turn Brown? 4 min Start
  8. 8 Why Do Some Trees Stay Green All Winter? 3 min Start
  9. 9 How Do Dandelion Seeds Fly? 3 min Start
  10. 10 Why Do Sunflowers Follow the Sun? 3 min Start
  11. 11 How Does a Venus Flytrap Catch Bugs? 3 min Start
  12. 12 Why Do Pine Cones Open and Close? 3 min Start
  13. 13 Why Do Mushrooms Pop Up After Rain? 3 min Start
  14. 14 Why Do Flowers Smell? 3 min Start
  15. 15 Why Do Trees Have Rings? 3 min Start
  16. 16 Where Does Maple Syrup Come From? 3 min Start
  17. 17 Why Does Corn Have Hair? 4 min Start
  18. 18 Why Does Grass Grow Back After You Mow It? 5 min Start
  19. 19 Why Don't Bananas Have Seeds? 5 min Start
Unit 3

Your Body

30 lessons · 95 min

  1. 1 Why Do We Have to Breathe? 3 min Start
  2. 2 Why Does My Heart Go Thump-Thump? 3 min Start
  3. 3 Why Do I Have to Go to Sleep? 3 min Start
  4. 4 Why Do We Get Goosebumps? 3 min Start
  5. 5 Why Do Fingers Get Wrinkly in the Bath? 3 min Start
  6. 6 Why Do We Get Hiccups? 3 min Start
  7. 7 How Does My Cut Get Better? 3 min Start
  8. 8 Why Do My Baby Teeth Fall Out? 3 min Start
  9. 9 Why Do I Get Sick? 3 min Start
  10. 10 Where Does the Sound of My Own Voice Come From? 4 min Start
  11. 11 Why Doesn't the Water Spill Out of Our Eyes When We Bend Over? 4 min Start
  12. 12 What Keeps My Skin Attached to Me? 4 min Start
  13. 13 Why Do My Ears Pop in an Airplane or on a Big Hill? 4 min Start
  14. 14 Why Do We Have Belly Buttons? 4 min Start
  15. 15 Why Do We Have Two Eyes? 3 min Start
  16. 16 Why Do We Sneeze? 3 min Start
  17. 17 Why Do I Have to Brush My Teeth? 3 min Start
  18. 18 Why Does Spinning Make You Dizzy? 3 min Start
  19. 19 Why Does My Foot Fall Asleep? 3 min Start
  20. 20 Why Do We Get Brain Freeze? 2 min Start
  21. 21 Why Does My Stomach Growl? 3 min Start
  22. 22 Why Do Grown-Ups Get Gray Hair? 3 min Start
  23. 23 Why Do We Blink? 3 min Start
  24. 24 Why Do We Get Thirsty? 3 min Start
  25. 25 Why Do We Burp? 3 min Start
  26. 26 Why Do We Shiver? 2 min Start
  27. 27 Why Do I Yawn When Someone Else Yawns? 3 min Start
  28. 28 Why Do My Veins Look Blue If My Blood Is Red? 3 min Start
  29. 29 Why Do We Have Fingerprints? 4 min Start
  30. 30 Why Does My Nose Run When It's Cold? 4 min Start
Unit 4

Earth & Weather

23 lessons · 78 min

  1. 1 Why Is the Sky Blue? 3 min Start
  2. 2 Why Is the Ocean Salty? 3 min Start
  3. 3 Where Does Wind Come From? 3 min Start
  4. 4 What Makes Thunder and Lightning? 3 min Start
  5. 5 How Do Snowflakes Get Their Six Points? 3 min Start
  6. 6 Where Do Rainbows Come From? 4 min Start
  7. 7 Why Does Ice Float? 3 min Start
  8. 8 Why Is It Cold in Winter and Hot in Summer? 4 min Start
  9. 9 If Rain Comes from Clouds, Why Doesn't the Whole Cloud Fall at Once? 4 min Start
  10. 10 Where Does the White Go When Snow Melts? 4 min Start
  11. 11 Why Do Volcanoes Blow Up? 4 min Start
  12. 12 Why Is the Grass Wet in the Morning? 3 min Start
  13. 13 How Does Wind Make Waves? 3 min Start
  14. 14 Where Does Fog Come From? 3 min Start
  15. 15 Why Does the Ground Shake in an Earthquake? 3 min Start
  16. 16 How Do Icicles Get So Long and Pointy? 2 min Start
  17. 17 Who Dug Out the Caves? 3 min Start
  18. 18 Where Does Beach Sand Come From? 3 min Start
  19. 19 Why Does a Hot Road Look Wet? 3 min Start
  20. 20 Why Do Balls of Ice Fall from the Sky? 3 min Start
  21. 21 Why Are There So Many Lakes Around Here? 4 min Start
  22. 22 Why Can I Smell Rain Before It Comes? 4 min Start
  23. 23 What Makes a Tornado? 6 min Start
Unit 5

Space

20 lessons · 64 min

  1. 1 Why Don't We Fall Off the Earth? 3 min Start
  2. 2 Where Does the Sun Go at Night? 3 min Start
  3. 3 Why Does the Moon Change Shape? 3 min Start
  4. 4 Why Can You See the Moon in the Daytime? 3 min Start
  5. 5 Why Is the Sun So Hot? 3 min Start
  6. 6 Why Do Stars Twinkle? 3 min Start
  7. 7 Why Does the Moon Follow the Car? 3 min Start
  8. 8 Where Do the Stars Go in the Daytime? 2 min Start
  9. 9 What Makes the Northern Lights? 3 min Start
  10. 10 Why Is Mars Red? 3 min Start
  11. 11 Why Are Sunsets Red and Orange? 3 min Start
  12. 12 Why Does the Moon Have So Many Craters? 3 min Start
  13. 13 What Are Shooting Stars? 3 min Start
  14. 14 Why Do Astronauts Float? 3 min Start
  15. 15 Why Does Saturn Have Rings? 3 min Start
  16. 16 What Is the Milky Way? 3 min Start
  17. 17 Why Do We Always See the Same Side of the Moon? 3 min Start
  18. 18 Why Does the Moon Look So Big When It's Rising? 4 min Start
  19. 19 What Is a Black Hole? 5 min Start
  20. 20 If the Sun Is So Bright, Why Is Space Dark? 5 min Start
Unit 6

How Things Work

30 lessons · 103 min

  1. 1 How Does Soap Get My Hands Clean? 4 min Start
  2. 2 How Does a Giant Airplane Stay Up in the Sky? 3 min Start
  3. 3 How Do Magnets Stick to Things? 3 min Start
  4. 4 Why Does a Rubbed Balloon Stick to the Wall? 3 min Start
  5. 5 Why Does a Spoon Look Bent in Water? 3 min Start
  6. 6 Why Does My Voice Bounce Back When I Yell? 3 min Start
  7. 7 Why Don't Birds Get Shocked When They Sit on Power Lines? 4 min Start
  8. 8 Why Doesn't Glue Stick to the Inside of the Bottle? 4 min Start
  9. 9 Why Does My Reflection in a Spoon Flip Upside Down? 4 min Start
  10. 10 How Can a Heavy Steel Boat Float When a Tiny Pebble Sinks? 4 min Start
  11. 11 Why Does Popcorn Pop? 4 min Start
  12. 12 Why Does a Compass Point North? 3 min Start
  13. 13 How Does a Fridge Keep Food Cold? 4 min Start
  14. 14 Why Do Bubbles Have Colors? 4 min Start
  15. 15 Why Does a Helium Balloon Float? 3 min Start
  16. 16 Why Do They Put Salt on Icy Roads? 3 min Start
  17. 17 Why Does Bread Rise? 3 min Start
  18. 18 How Do Glow-in-the-Dark Toys Work? 3 min Start
  19. 19 How Does a Microwave Heat Food? 3 min Start
  20. 20 How Does a Battery Make My Toys Go? 3 min Start
  21. 21 How Does a Screen Make All Those Colors? 3 min Start
  22. 22 How Does a Straw Pull My Drink Up? 3 min Start
  23. 23 How Does a Touchscreen Know Where You Touch? 3 min Start
  24. 24 How Does a Zipper Work? 3 min Start
  25. 25 How Do Glasses Help People See Better? 3 min Start
  26. 26 How Does a Thermos Keep Soup Hot? 3 min Start
  27. 27 What Is Fire Made Of? 4 min Start
  28. 28 How Does a Bike Stay Up When It's Moving? 4 min Start
  29. 29 How Does a Toilet Flush? 4 min Start
  30. 30 How Does a Light Bulb Light Up? 5 min Start