Whose Foot is a Foot Long? --
How Long a Hot Dog Would You Make? --
What is the Maximum Nail Spacing for a Comfortable Bed of Nails? --
What is the Smallest Suction Cup You would Use to Walk on the Ceiling? --
What Are the Longest and Narrowest Straws You could suck through? --
How Tall can trees grow? --
What Is the Largest Possible Creature? --
What is the Smallest Living Thing? --
How Sky-high Is the National Debt? --
How Far Can the Top Brick in a Pile Project Out? --
How Big Is the Doomsday Rock? --
How Close Could You Get to Ground Zero and Survive? --
How Long Is Britain's Costline? --
What is an Automobile's Stopping Distance? --
How Far Does an Object Fall in One Second? --
How Big Should Movie Models Be? --
Where Would the Body Land? --
What Is the Length of a One-Second Pendulum? --
How High Can You Jump? --
How Big Can a Water Droplet Get? --
How Far Does Sound Travel in One SEcond? --
How Far Does Light Travel in One Second? --
What is the Greatest Distance Anything Can Go in One Second? --
Are Faster-Than-Light Speeds Allowed? --
What Is the Quickest Trip between Two Points? --
How Slow Can Light Go? --
How Far Do Electromagnetic Waves Travel in One Second? --
How Small Is the Wavelength of Light? --
How Dark Can Light Get? --
How Far Apart Are the Earth's Two North Poles? --
How Big is the Earth's Diameter? --
How Far Does the Moon Fall Each Second? --
How Far Are "Stationary" Satellites? --
At What Point Would the Earth and the Moon Balance on the Seesaw? --
At What Point Do Earth and Moon's Gravity Cancel? --
How High Can Mountains Get? --
What Is the Largest Possible Cubic Planet? --
How Big a "Bulging Waistline" Do Planets Develop? --
How Much Farther Is the Moon Each Month? --
How Close Can a Moon Get? --
How Large Is Our Galaxy? --
How Far Are Other Galaxies? --
How Bis is the Universe? --
How Big Are the Bubbles in the Cosmological Milk Shake? --
How Big is a Fog Droplet? --
What is the Smallest Object That Can Be Seen? --
How Close Toghether Are Atoms in Solids? --
How Do We Know Atoms Have Nuclei? --
How Much of Your Body Is Empty Space? --
How Close Together Are Molecules in Air? --
One a Clear Day Could You See Forever? --
How Big Are Electron Orbits in Atoms? --
How Far Could an Object Coast? --
How Much Do You Weigh Wet and Dry? --
What Is the Heaviest Creature That Could Walk on Water? --
What is the Difference between Mass and Weight? --
What Is the Heaviest Mass Your Could Push? --
What Would You Weigh Falling in an Elevator? --
How Much Does Your Weight Vary on Earth? --
What Would You Weigh in a SpaceStation? --
What Would You Weigh inside the Earth? --
How Much Would You Weigh on Different Heavenly Bodies? --
On How Big a Planet could You Hit a Baseball into Orbit? --
How Massive is the Earth? --
How Massive is the Sun? --
How Massive is the Moon? --
How Massive Are the Planets? --
How Massive are the Stars? --
What ARe the Lowest and Highest Masses a Star Can Have? --
What is the Lowest mass of a Neutorn Star? --
How Massive Are Black Holes? --
What Are the Most Massivand Least Massive Black Holes? --
How Massive Are Galaxies? --
How Massive Are Atoms? --
How Is the Pion's Mass Related tothe Range of Nuclear Forces? --
What Is the Heaviest Possible Stable Atom? --
What is the Most Stable Nucleus? --
What is the Largest Possible Mass of Plutonium Sphere? --
What is the Lightest Gas on Earth? --
What is Your Mass When Going Close to the Speed of Light? --
What Are the Massess of Subatomic Particles? --
Do Neutrinos Really have Zero Mass? --
What Are the Masses of Quarks? --
Could Objects Have Negative Weight or Mass? --
At What Temperatures Does Water Boil and Freeze? --
What is the Temperature at the Bottom of Frozen Lakes? --
Why Does Hot plus Cold Not Always Equal Warm? --
When Should You Add Cream to Your Coffee? --
How Much Hotter Is the Bottom of a Waterfall Than the Top? --
What is the Lowest Possible Temperature? --
How Close to Absolute Zero Can We Get? --
Is There a Highest Possible Temperature? --
What is the Most Efficient Engine Combustion Temperature? --
How Hot is the Earth's Center? --
How Hot is the Surface of the Sun? --
How Hot is the Interior of the Sun? --
How Hot or Cold Can Stars Get? --
How Hot Is the Hottest Superconductor? --
How Much Global Warming? --
Nuclear WInter or Nuclear Summer? --
how Fast Should You Jump in a Falling Elevator to Survive? --
At What Speed Should You Walk to Get Least Wet in a Rainstorm? --
How Fast Does Electricity Travel in Wires? --
How Fast Can Chemical Rockets Travel? --
How Fast Do Subatomic Particles Travel in Accelerators? --
Might There Be Faster-Than-Light-Particles? --
Does the Earth Really Rotate? --
What is the Earth's Speed through Space? --
What is the Slowest Possible Speed? --
At What Speed Do the Continents Drift Apart? --
What is Your Age versus Your Spaceship's Twin's? --
How Old Is the Universe? --
How Old Are the Stars? --
How Does Radioactive Dating Work? --
Why Do Carbon Atoms Provide Some of Our Best Recent Dates? --
When Was the North Pole a South Pole? --
How Long Has it Been since the Last Mass Extinction? --
How Old Is Life on Earth?.
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