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Book 23, Question 127 · Video

How Do You Test a Paper Plane Fairly?

Video · 2:01 · Crafty Clover explains, from A Million Whys Book 23

A fair test changes only one thing. Everything else stays the same. Many tries beat one lucky throw! One-change tests are called controlled experiments.

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What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. How do you test a paper plane fairly?

The Big Idea

A fair test changes only one thing. Everything else stays the same. Many tries beat one lucky throw!

Change One Thing

Step one: change one thing. Scientists change only one thing at a time and keep everything else the same. If you test wing size, use the same paper, the same fold, and the same throw.

Repeat the Test

Step two: repeat the test. Test each plane several times and write down every result. One lucky throw can trick you.

Use the Average

Step three: use the average. The average of many tries is more trustworthy than a single lucky throw. A test where only one thing changes is called a controlled experiment.

A Closer Look

Let's take a closer look! Change only one thing. Keep the throw the same. Write every result. Find the average.

Quick Facts

Quick facts! One-change tests are called controlled experiments. Writing results stops you from forgetting. Five throws beat one lucky toss. Averages help you trust your answer.

Think Like a Scientist

Now, think like a scientist! Pick one thing to test, such as a paper clip on the nose. Throw each plane five times and calculate the average. Throw away from people and pets, and never at faces. Keep every other detail the same. Share what you discover with a grown-up.

Outro

Fair paper-plane tests change only one thing at a time, repeat many throws, write every result, and trust the average more than a single lucky toss. Science is amazing! Keep wondering and keep exploring! Share what you learned with someone at home, and see what they think! Ask a grown-up to help you try a controlled experiment safely, and compare your averages together. Keep looking up! Keep learning together! Wonder never runs out! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!

Why I wrote this