Listen

Listen to Book 22: The Energy Expedition

All 150 answers from Book 22, read aloud. Press play and keep listening, or tap a question to jump to it. Each title links to its page with the video and the full answer.

Press play to start with question 1.

Keep playing

1.What Exactly Is Energy?
2.How Can You Tell Energy Is There When You Can’t See It?
3.What Kinds of Energy Are There?
4.How Is Stored Energy Different From Moving Energy?
5.Why Can Energy Never Be Made or Destroyed?
6.Where Does a Ball’s Energy Go When It Stops Rolling?
7.What Does It Mean to “Use Up” Energy?
8.Why Does a Stretched Rubber Band Hold Energy?
9.Why Does a Book on a High Shelf Hold Energy?
10.What Is the Energy Hiding in Food, Fuel, and Batteries?
11.Why Do Scientists Call Heat Energy on the Move?
12.How Does Energy Change From One Form Into Another?
13.How Can You Follow Energy From the Sun to Your Toast?
14.Why Do Machines Waste Some Energy?
15.What Does “Work” Mean in Science?
16.What Is Power, and How Is It Different From Energy?
17.How Do We Count Energy?
18.How Did James Joule Show That Motion Can Turn Into Heat?
19.Do Rocks and Mountains Have Energy?
20.Why Do People Say “Save Energy” If Energy Never Disappears?
21.What Happens to Energy When Two Things Bump?
22.Why Does It Take Energy to Make Something Move, Even a Little?
23.Is There Energy Inside Atoms?
24.Can a Wave Carry Energy Without Carrying Stuff Along?
25.Why Can’t We Build a Machine That Runs Forever?
26.What Is Kinetic Energy, the Energy of Motion?
27.Why Does a Diver on a High Board Hold Potential Energy?
28.Why Does Speed Matter So Much for Moving Energy?
29.Why Does a Heavy Truck Have So Much More Moving Energy than a Bicycle?
30.How Does a Roller Coaster Trade Height for Speed?
31.Why Does a Pendulum Swing Back and Forth?
32.Why Does a Ball Speed Up Faster on a Steeper Hill?
33.Where Does a Squashed Spring’s Stored Energy Go When You Let Go?
34.How Does a Wind-Up Toy Store Energy?
35.Why Does Falling From Higher Up Hurt More?
36.How Does a Moving Bowling Ball Pass Energy to the Pins?
37.Why Can One Domino Knock Over a Whole Row?
38.Where Does the Energy Come From When You Jump?
39.How Does a Toy Catapult Launch Things?
40.How Does a Cyclist Use Energy to Climb a Hill and Then Coast?
41.Where Does the Energy Go When Bike Brakes Stop You?
42.How Do Electric and Hybrid Cars Save Energy While Braking?
43.How Does a Flywheel Store Energy?
44.How Does a Hand-Crank Flashlight Work Without Batteries?
45.How Does a Yo-Yo Store Spinning Energy?
46.How Does a Balloon Rocket Use Stored Energy?
47.Why Does a Pogo Stick Make You Bounce?
48.How Does a Zipline Turn Height Into Speed?
49.Why Is a Heavy Box Harder to Push than an Empty One?
50.How Do Helmets and Padding Soak Up Moving Energy?
51.How Does the Sun’s Energy Cross Empty Space to Reach Us?
52.What Makes the Sun Give Off So Much Energy?
53.How Much of the Sun’s Energy Does Earth Actually Catch?
54.How Can Heat Travel From Place to Place?
55.Which Holds More Heat: a Cup of Hot Tea or a Tub of Warm Water?
56.How Does a Blanket Keep You Warm If It Makes No Heat?
57.How Does a Leaf Turn Sunshine Into Food?
58.How Is a Solar Water Heater Different From a Solar Panel?
59.What Is Infrared Light?
60.Why Does a Parked Car Get So Hot with the Windows Closed?
61.Why Do Very Hot Things Glow?
62.Why Does Sand Heat Up Faster than Water?
63.How Does the Sun’s Energy Keep Water Moving Around the Planet?
64.What Invisible Rays Does the Sun Send Us?
65.How Much Power Does Sunshine Bring to One Square Meter?
66.How Did People Long Ago Put Sunshine to Work?
67.How Much Power Does a Solar Panel Lose When Clouds Roll In?
68.How Does a Thermos Keep Soup Warm?
69.How Does a Hot-Water Radiator Warm a Room?
70.What Happens to Light When Something Swallows It?
71.What Are the Tiny Packets of Energy in a Sunbeam?
72.How Much Heat Does a Person Give Off?
73.How Hot Is the Sun’s Surface, and How Hot Is Its Core?
74.How Do Astronauts Keep Cool in Space Where There Is No Air?
75.Why Doesn’t Earth Keep Getting Hotter If the Sun Keeps Sending Energy?
76.How Do Scientists Find Out How Much Energy Is in a Peanut?
77.Why Is the Calorie on a Food Label Spelled with a Capital C?
78.How Does Your Body Get Energy Out of Food?
79.How Do Your Cells Burn Food Without Fire?
80.Why Does Your Body Make Its Own Heat?
81.How Do Muscles Use Food Energy to Move?
82.Why Do Small Animals Eat So Much for Their Size?
83.Why Do Reptiles Need Less Food than Mammals?
84.Where Does Energy Go as It Moves Up a Food Chain?
85.Why Do Ecosystems Have So Many More Plants than Meat-Eaters?
86.How Do Plants Store the Energy They Make?
87.What Makes Fat Such a Good Energy Bank?
88.How Does Hibernating Save Energy?
89.What Is Metabolism?
90.Where Does the Energy in Coal and Oil Come From?
91.Why Does Burning Release Stored Energy?
92.Why Do Liquid Fuels Pack So Much Energy?
93.How Does a Car Engine Turn Fuel Into Motion?
94.What Is Biofuel?
95.How Did People First Use Wood to Cook and Stay Warm?
96.How Can Rotting Food Scraps Make Fuel?
97.How Can an Eel’s Body Make Electric Shocks?
98.Why Can a Cheetah Sprint Fast but Not for Long?
99.Why Do Migrating Birds Eat So Much Before a Long Trip?
100.How Do Deep-Sea Animals Get by with So Little Food?
101.How Does a Power Plant Make Electricity for a Whole Town?
102.What Is the Power Grid?
103.Why Do Long-Distance Power Lines Use Such High Voltage?
104.Why Do Many Power Plants Burn Fuels Like Coal and Gas?
105.What Makes an Energy Source Renewable?
106.How Does a Wind Turbine Turn Wind Into Electricity?
107.Why Do Wind Farms Put Their Turbines So High Up?
108.How Do Rooftop Solar Panels Share Power with the Grid?
109.How Does a Tidal Power Station Use the Ocean?
110.How Can Ocean Waves Make Electricity?
111.What Is Nuclear Energy, and How Does a Power Plant Use It?
112.What Happens to Solar and Wind Power When the Sun Sets or the Wind Stops?
113.How Can We Store Extra Electricity?
114.How Does Pumped Storage Work Like a Giant Water Battery?
115.What Is a Kilowatt-Hour on an Electricity Bill?
116.Why Does the Electricity in a Town Sometimes Go Out?
117.How Do Solar Lamps and Small Grids Bring Light to Faraway Places?
118.How Is an Electric Car Charged, and Where Does That Energy Come From?
119.Can Hydrogen Be a Clean Fuel?
120.How Much Electricity Can You Make by Pedaling?
121.Why Do Solar Panels in Canada Face South?
122.What Is That Gray Can on the Power Pole?
123.Why Do Some Power Plants Have Giant Cooling Towers?
124.Why Does Electricity Use Go Up in the Evening?
125.What Is the Trade-Off with Each Energy Source?
126.What Does Energy Efficiency Mean?
127.What Do Energy Star and EnerGuide Labels Tell Us?
128.Why Do Some Devices Use Power Even When They Are Turned Off?
129.Why Do Windows Let So Much Heat Escape in Winter?
130.How Does Insulation Keep a House Cozy?
131.How Does a Thermostat Know When to Turn the Heat On?
132.How Does a Heat Pump Move Heat Instead of Making It?
133.Why Does Hanging Laundry Outside Save Energy?
134.What Happens If the Fridge Door Stays Open?
135.Why Does Putting a Lid on a Pot Save Energy?
136.Does Taking a Shorter Shower Really Save Energy?
137.How Can Trees Around a House Save Energy?
138.What Is Passive Solar Design?
139.Is Biking More Energy-Efficient than Driving?
140.How Can You Find Drafts in Your Home?
141.Which Energy-Saving Habits Matter Most?
142.How Do Motion-Sensor Lights Save Energy?
143.Why Does a Phone Charger Feel Warm?
144.Why Does Recycling an Aluminum Can Save Energy?
145.What New Energy Ideas Are Scientists Testing?
146.How Can Your Class Run an Energy-Saving Project?
147.Can Footsteps on a Special Floor Make Electricity?
148.Which Things in a Home Use the Most Energy?
149.Why Do Small Energy Savings Add Up?
150.What Are the Big Ideas to Remember About Energy?

The audio is the sound from each video, so it includes soft background music.

Buy on Amazon Watch the Book 22 videos All listening playlists

More books to listen to: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24