Koko:
Owlo! Owlo! I have to tell you something so exciting. I saw the most beautiful thing on my way to school today!
Owlo:
Good morning, Koko! You look like you are about to burst. What did you see?
Koko:
A rainbow! A giant, colorful rainbow right in the sky. It had so many colors. I stopped and just stared at it.
Owlo:
Oh, how wonderful! I love when rainbows appear after a rainy morning. They always feel like a little surprise gift from the sky.
Koko:
But Owlo, how does a rainbow get there? Nobody painted it. There are no crayons in the sky.
Owlo:
That is such a magical question, Koko. And the answer is just as magical. Let me think of the best way to show you.
Koko:
Can we use something in the school to figure it out? I really want to understand it.
Owlo:
Actually, yes! The science lab has exactly what we need. Follow me, and bring your curiosity.
Owlo:
Here we are. Now, Koko, do you know what sunlight is made of?
Koko:
Umm, it is just light? Like, bright and warm light from the sun?
Owlo:
You are right that it is bright and warm. But here is the secret. Sunlight is actually made of many colors, all mixed together.
Koko:
Wait, really? It just looks white and yellow to me. Where are all the colors hiding?
Owlo:
They are hiding inside the light! Watch what happens when I shine this torch through this glass triangle. This triangle is called a prism.
Koko:
Whoa! Look at that! Colors are coming out the other side. Red, orange, yellow, green, blue, and purple!
Owlo:
Exactly! The prism bends the light, and when light bends, all those hidden colors separate and we can finally see them.
Koko:
So the colors were inside the light the whole time? That is so sneaky.
Owlo:
Very sneaky indeed! Now, here is the next piece of the puzzle. What do you think tiny raindrops in the sky might do to sunlight?
Koko:
Hmm. Are the raindrops like tiny little prisms?
Owlo:
Koko, you are absolutely right. Each tiny raindrop acts just like a little prism. It bends the sunlight and splits out all the colors.
Koko:
And there are SO many raindrops after it rains. So there are millions of tiny prisms all at once!
Owlo:
Millions and millions of them, all bending light at the same time. And together, they make one big, beautiful arc of color in the sky.
Koko:
An arc! That is why it is curved like a smile. I love that. A rainbow is like the sky smiling at us.
Owlo:
I have never thought of it quite that way before, but I think you are absolutely right. It does look like a big smile.
Koko:
Owlo, can I always see a rainbow after rain? Like, every single time?
Owlo:
Not every time, Koko. You need two things together. You need sunshine and raindrops in the sky at the same time.
Koko:
Oh! So if it is raining but the sun is hiding behind clouds, no rainbow. But if the sun comes out while it is still raining, then rainbow!
Owlo:
Perfect! You have got it exactly right. And there is one more fun thing. You need to be standing with the sun behind you to see it.
Koko:
The sun has to be behind me? That is so funny. So the rainbow is always in front of me and the sun is always behind me.
Owlo:
That is the trick! The light travels from the sun, into the raindrops in front of you, and then bounces back to your eyes.
Koko:
This is the coolest thing I have ever learned. Rainbows are not magic. They are science. But they still feel like magic.
Owlo:
That is one of my favorite things about science, Koko. Understanding something does not make it less wonderful. It often makes it even more wonderful.
Koko:
Owlo, can you ask me to say everything I learned? I want to try to remember it all.
Owlo:
I was just about to do that! Go ahead, Koko. Tell me everything you now know about rainbows.
Koko:
Okay! So, sunlight has all the colors hidden inside it. When light goes through a raindrop, the raindrop bends it and the colors split apart. Millions of raindrops do this all at once, and together they make a rainbow. You need sunshine and rain at the same time, and the sun has to be behind you. And also, a rainbow is shaped like a smile, which I think is the best part.
Owlo:
That was a perfect summary, Koko. I could not have said it better myself.
Koko:
Next time I want to find out why the rainbow always has the same colors in the same order. Like, why is red always on top?
Owlo:
Now that, my curious little fox, is a wonderful question for another day.