木曜日は、マリーのはてな日記/Marie the Scientist
「ホコリはどこからやってくるの？/Where does dust come from?」
Where does dust come from?
My grandmother came to visit me today at our house.
She is really cool.
She loves fashion and science just like me.
We were laughing and talking and then my mom came and said,
“Marie, did you practice the piano?”
“Not yet, Mom.
I’ll do it later.”
“I don’t think you have played it for at least three days.”
“That’s not true.
I practice yesterday.”
Then why do I see dust on the piano?”
“If there is dust, it means you haven’t touched for a long time.”
“But it doesn’t mean Marie is lying, you know.”
“Thank you, Grandma!
By the way, where does dust come from?”
“Pick up some dust and look at it closely, Marie.
What do you see?”
“I’ve never really looked at dust before.
It’s just a small white fluffy ball.”
“Now put that dust on a black sheet of paper and look at it with a magnifying glass.
Then you can see it really well.”
“Wow, there are many thin pieces of string.”
“They are called fibers, Marie.”
“So where do these fibers come from, Grandma?”
“Well, some of them come from your clothes.
Your clothes are made from fibers, too.
So when you put on or take off your clothes, fibers fall off.”
“Oh, I didn’t know that.”
“Fibers come from tissue paper too.
Take one tissue out of that box and tear it, Marie.”
I see very small things floating.”
“Those are fibers.
They are small and light so they float in the air.
After a while, they slowly come down in a day or so.
They land on the floor and even on your piano.
It’s difficult to see each separate fiber but when they come together we can see them.
That is dust.”
“Did you hear that, Mom?
Even if I practice the piano every day, dust will be there.”
I understand your point.
But Marie, be sure to clean the dust.
Dust often has dead bodies of small insects and pieces of mold in it.
I’ve seen that on bread and it’s in dust.
Mom, please clean the house.”
“Good idea, Maire.
You can help me.”
So now, I am going to clean the dust off my piano every day.