What If chapters

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This is a list of What If? articles, published either in Randall Munroe's book What If? or on the blog. If the article has a different name in the book than on the blog, then the alternative title will be listed alongside the blog title.

Article title Alternative title Website no. Book chapter
Relativistic Baseball 1 2
SAT Guessing 2 66
Yoda 3 32
Mole of Moles 4 10
Robot Apocalypse 5
Glass Half Empty 6 26
Everybody Out 7 35
Everybody Jump 8 9
Soul Mates 9 6
Cassini 10
Droppings 11
Raindrop 12 65
Laser Pointer 13 7
Short Answer Section 14
Mariana Trench Explosion 15
Today’s topic: Lightning Lightning 16 19
Green Cows 17
BB Gun 18
Tie Vote 19
Diamond 20
Machine-Gun Jetpack 21 14
Cost of Pennies 22
Short Answer Section II Short-Answer Section 23 18
Model Rockets 24
Three Wise Men 25
Leap Seconds 26
Death Rates 27
Steak Drop 28 23
Spent Fuel Pool 29 3
Interplanetary Cessna 30 30
FedEx Bandwidth 31 44
Hubble 32
Ships 33
Twitter 34 50
Hair Dryer 35 11
Cornstarch 36
Supersonic Stereo 37
Voyager 38
Hockey Puck 39 24
Pressure Cooker 40
Go West 41
Longest Sunset 42 52
Train Loop 43
High Throw 44 38
ISS Music Video 45
Bowling Ball 46
Alien Astronomers 47 28
Sunset on the British Empire 48 60
Sunless Earth 49 57
Extreme Boating 50
Free Fall 51 45
Bouncy Balls 52
Drain the Oceans 53 48
Drain the Oceans: Part II 54 49
Random Sneeze Call 55 53
Restraining an Airplane 56
Dropping a Mountain 57
Orbital Speed 58 43
Updating a Printed Wikipedia 59 58
Signs of Life 60
Speed Bump 61 41
Falling with Helium 62 34
Google’s Datacenters on Punch Cards 63
Rising Steadily 64 15
Twitter Timeline Height 65
500 MPH 66
Expanding Earth 67 55
Human Computer 68 21
Facebook of the Dead 69 59
The Constant Groundskeeper 70
Stirring Tea 71 61
Loneliest Human 72 63
Lethal Neutrinos 73 39
Soda Planet 74
Phone Keypad 75
Reading Every Book 76
Growth Rate 77
T-rex Calories 78
Lake Tea 79
Pile of Viruses 80
Catch! 81
Hitting a comet 82
Star Sand 83
Paint the Earth 84
Rocket Golf 85
Far-Traveling Objects 86
Enforced by Radar 87
Soda Sequestration 88
Tungsten Countertop 89
Great Tree, Great Axe 90
Faucet Power 91
One-Second Day 92
Windshield Raindrops 93
Billion-Story Building 94
Pyramid Energy 95
$2 Undecillion Lawsuit 96
Burning Pollen 97
Blood Alcohol 98
Starlings 99
WWII Films 100
Plastic Dinosaurs 101
Keyboard Power 102
Vanishing Water 103
Global Snow 104
Cannibalism 105
Ink Molecules 106
Letter to Mom 107
Expensive Shoebox 108
Into the Blue 109
Walking New York 110
All the Money 111
Balloon Car 112
Visit Every State 113
Antimatter 114
Into the Sun 115
No-Rules NASCAR 116
Distant Death 117
Physical Salary 118
Laser Umbrella 119
Alternate Universe What Ifs 120
Frozen Rivers 121
Lava Lamp 122
Fairy Demographics 123
Lunar Swimming 124
Bowling Ball 125
Stairs 126
Tug of War 127
Zippo Phone 128
Black Hole Moon 129
Snow Removal 130
Microwaves 131
Hotter than Average 132
Flagpole 133
Space Burial 134
Digging Downward 135
Spiders vs. the Sun 136
New Horizons 137
Jupiter Submarine 138
Jupiter Descending 139
Proton Earth, Electron Moon 140
Sunbeam 141
Space Jetta 142
Europa Water Siphon 143
Saliva Pool 144
Fire from Moonlight 145
Stop Jupiter 146
Niagara Straw 147
Eat the Sun 148
Pizza Bird 149
Tattooine Rainbow 150
Sun Bug 151
Flood Death Valley 152
Hide the Atmosphere 153
Coast-to-Coast Coasting 154
Toaster vs. Freezer 155
Electrofishing for Whales 156
Earth-Moon Fire Pole 157
Global Windstorm 1
Weird (and Worrying) Questions from the What If? Inbox, #1 4
New York–Style Time Machine 5
Periodic Wall of the Elements 8
Weird (and Worrying) Questions from the What If? Inbox, #2 12
The Last Human Light 13
Weird (and Worrying) Questions from the What If? Inbox, #3 16
Orbital Submarine 17
Weird (and Worrying) Questions from the What If? Inbox, #4 20
Little Planet 22
Common Cold 25
Weird (and Worrying) Questions from the What If? Inbox, #5 27
No More DNA 29
Weird (and Worrying) Questions from the What If? Inbox, #6 31
Flyover States 33
Weird (and Worrying) Questions from the What If? Inbox, #7 36
Self-Fertilization 37
Weird (and Worrying) Questions from the What If? Inbox, #8 40
Lost Immortals 42
Weird (and Worrying) Questions from the What If? Inbox, #9 46
Sparta 47
Lego Bridge 51
Weird (and Worrying) Questions from the What If? Inbox, #10 54
Weightless Arrow 56
Stirring Tea 62
Weird (and Worrying) Questions from the What If? Inbox, #11 64
Neutron Bullet 67
Weird (and Worrying) Questions from the What If? Inbox, #12 68
Richter 15 69


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