The Great Expedition Series, Book 10

A Million Whys: The Body Expedition for Curious Kids

By Crafty Clover. Published by Million Whys Press.

Why Does Your Body Need a Skeleton? Why Is the Brain the Boss? Why Do We Wash Cuts? This book answers 150 questions like these, one question per page, each with a short video answer. Six expeditions: Bones, Muscles & Moving, Heart, Blood & Breath, Brain, Sleep & Feelings, Senses Superpowers, Germs, Healing & Staying Strong, and Body Detectives & Healthy Habits.

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All 150 questions

Tap a question to watch its video and read the answer.

Expedition 1: Bones, Muscles & Moving

1. Why Does Your Body Need a Skeleton?
2. Why Do Babies Have More Bones than Adults?
3. Why Is Cartilage in Your Nose and Ears?
4. Why Do Joints Let You Bend?
5. Why Does Cracking Knuckles Make Noise?
6. Why Do Muscles Pull But Not Push?
7. Why Do Goosebumps Pop Up When You Are Cold or Scared?
8. Why Warm Up Before Sports?
9. Why Do Tendons Connect Muscle to Bone?
10. Why Do Ligaments Connect Bone to Bone?
11. Why Do Some Kids Get Grow Pains?
12. Why Is Posture Helpful?
13. Why Do Backpacks Need Two Straps?
14. Why Do Bones Heal After Breaks?
15. Why Is Calcium Famous for Bones?
16. Why Do You Get Taller in Spurts?
17. Why Do Fingers Get Wrinkly in Long Baths?
18. Why Is Core Strength About More than Abs?
19. Why Do Dancers Build Strong Feet?
20. Why Stretch After Exercise?
21. Why Do Calluses Form?
22. Why Is Rest Part of Getting Stronger?
23. Why Do Sneakers Cushion Landings?
24. Why Practice Balance?
25. Why Move Every Day?

Expedition 2: Heart, Blood & Breath

26. Why Does Your Heart Beat All By Itself?
27. Why Can a Stethoscope Let You Hear a Heartbeat?
28. Why Does Heart Rate Rise When You Sprint?
29. Why Does Your Face Turn Red When You Run or Feel Embarrassed?
30. Why Do You Have Different Blood Types?
31. Why Do Veins Look Blueish Under Skin?
32. Why Do You Need Lungs?
33. Why Are There So Many Alveoli?
34. Why Is Yawning Contagious?
35. Why Do You Cough When Something Goes Down the Wrong Way?
36. Why Does Exercise Make You Breathe Harder?
37. Why Is Nose Breathing Often Helpful at Rest?
38. Why Does a Stuffy Nose Change Your Voice?
39. Why Do You Need Iron in Food?
40. Why Do Cuts Stop Bleeding with Clots?
41. Why Measure Blood Pressure?
42. Why Are Arteries Thicker-Walled than Veins?
43. Why Does Laughing Feel Good in Your Chest?
44. Why Can’t You Hold Your Breath Forever?
45. Why Do Inhalers Help Some Kids with Asthma?
46. Why Do People Take CPR Classes?
47. Why Does Altitude Make Some People Breathless?
48. Why Does Blood Have a Liquid Part Called Plasma?
49. Why Warm Up Cold Fingers By Moving?
50. Why Thank Your Heart Today?

Expedition 3: Brain, Sleep & Feelings

51. Why Is the Brain the Boss?
52. Why Do Brains Have Wrinkles?
53. Why Do Neurons ‘Talk’ with Sparks and Chemicals?
54. Why Do Growing Kids Need More Hours of Sleep than Adults?
55. Why Do We Forget Most of Our Dreams Soon After Waking?
56. Why Do Nightmares Feel So Real?
57. Why Is a Bedtime Routine Helpful?
58. Why Can Babies Read Faces Before They Can Talk?
59. Why Does Fear Make Your Heart Race?
60. Why Is It Okay to Say No to a Hug?
61. Why Practice Naming Feelings?
62. Why Do Habits Form?
63. Why Is Practice Better than One Long Cram?
64. Why Do You Forget Some Things?
65. Why Can a Favorite Song Give You Chills?
66. Why Do Optical Illusions Trick You?
67. Why Is Curiosity Good for Brains?
68. Why Do You Need Breaks From Screens?
69. Why Do Scary Events Make Your Body Feel Jumpy Afterward?
70. Why Does Gratitude Practice Help Some People?
71. Why Are Mistakes Useful?
72. Why Do Friends Matter for Brains?
73. Why Can Worry Shrink with Action Steps?
74. Why Protect Your Head in Sports?
75. Why Is Thinking About Your Own Thinking Useful?

Expedition 4: Senses Superpowers

76. Why Do People Say You Have Five Senses, or Even More?
77. Why Do Pupils Change Size?
78. Why Are Two Eyes Better for Depth?
79. Why Does the Blind Spot Exist?
80. Why Do Ears Help with Balance?
81. Why Does Loud Noise Risk Hearing?
82. Why Is It Okay to Cover Your Ears When a Siren Is Very Loud?
83. Why Does Smell Warn You of Smoke?
84. Why Does Taste Need Saliva?
85. Why Is Touch Not Just One Sense?
86. Why Are Your Fingertips So Good at Feeling Small Details?
87. Why Can You Touch Your Nose with Your Eyes Closed?
88. Why Do You Sweat and Get a Runny Nose When You Eat Spicy Food?
89. Why Do Your Eyes Get Red and Puffy When You Cry?
90. Why Wear Sunglasses in Bright Glare?
91. Why Does Motion Sickness Happen?
92. Why Do Some People Have Trouble Telling Red From Green?
93. Why Does Closing Your Eyes Make You Notice Sounds More?
94. Why Do Glasses Have Curved Lenses?
95. Why Do People Learn Braille and Sign Languages?
96. Why Do Some Nerves Sense Cold and Others Sense Heat?
97. Why Can Your Nose Smell Cookies From Across the House?
98. Why Do Small Brave Steps Help with Mild Fears?
99. Why Are Smoke Detectors Better than Noses Alone?
100. Why Train Your Senses on Purpose?

Expedition 5: Germs, Healing & Staying Strong

101. Why Do We Wash Cuts?
102. Why Does a Bruise Turn Purple, Then Green, Then Yellow?
103. Why Do Vaccines Train Your Immune System?
104. Why Does a Fever Make You Feel Hot and Shivery?
105. Why Do Coughs and Sneezes Need a Tissue or Your Elbow?
106. Why Do Lymph Nodes Swell When You’re Sick?
107. Why Are Antibiotics Wrong for Colds?
108. Why Do You Feel Sleepy When You Are Sick?
109. Why Eat Yogurt with Live Cultures Sometimes?
110. Why Does Itching Happen Around Healing Skin?
111. Why Use Sunscreen?
112. Why Do Allergies Happen?
113. Why Do Some People Carry an Epinephrine Auto-Injector?
114. Why Brush and Floss Teeth?
115. Why Do Dentist Visits Matter Even Without Pain?
116. Why Stay Home From School When You Are Contagious?
117. Why Do Stitches Help Some Cuts?
118. Why Is Smoke Bad for Healing Lungs?
119. Why Do People with Arm Casts Need to Raise the Arm Sometimes?
120. Why Keep Tetanus Shots Updated?
121. Why Hydrate When You Have Diarrhea or Fever?
122. Why Do Scars Fade Over Time But Never Disappear?
123. Why Should You Listen to Pharmacists About Storing Medicine?
124. Why Is Handwashing a Community Superpower?
125. Why Should You Finish Antibiotics When the Doctor Says To?

Expedition 6: Body Detectives & Healthy Habits

126. Why Eat Colorful Meals?
127. Why Does Protein Help You Grow and Repair?
128. Why Limit Sugary Drinks?
129. Why Does Breakfast Help Many Kids?
130. Why Is It Smart to Sip Water Before You Feel Thirsty?
131. Why Schedule Outdoor Play?
132. Why Do Both Strength and Cardio Matter?
133. Why Stretch After Sitting for a Long Time?
134. Why Is a Steady Sleep Schedule Better than Staying Up Late on Weekends?
135. Why Manage Screen Time with Family Rules?
136. Why Should You Replace Your Toothbrush Every Few Months?
137. Why Wear Seat Belts?
138. Why Learn Basic First Aid?
139. Why Tell a Trusted Adult About Bullying or Big Stress?
140. Why Do Annual Checkups Matter?
141. Why Does Your Neck Get Tired When You Look Down at a Screen?
142. Why Do Muscles Feel Sore a Day After Something New?
143. Why Cook Together as a Habit?
144. Why Limit Energy Drinks for Kids?
145. Why Can Mindfulness or Quiet Time Help Your Body?
146. Why Track How Your Habits Make You Feel?
147. Why Include Joyful Movement, Not Only Formal Exercise?
148. Why Does Your Body Send Warning Signs, Like Dizziness, When It Gets Too Hot?
149. Why Be Kind to Bodies of All Shapes?
150. Why Do Doctors and Scientists Still Have So Much to Learn About the Human Body?