木曜日は、マリーのはてな日記/Marie the Scientist
「人間はなぜ死ぬの？/Why do people die?」
人間はなぜ死ぬの？/Why do people die?
Today, Ms.Sato, our homeroom teacher, didn’t come to school.
So Mr. Fujita at our class.
Haruto asked Mr.Fujita,
“Do you know where Ms.Sato is?”
“She had some bad news.
Her mother died last night.”
“Oh, I feel sorry for her.
My great grandfather died last year and I miss him.
He was 94 years old.”
“It’s sad when people die.
But we will all die someday.
We should live each day with a smile on our faces.”
I was listening to their conversation and a question came to my mind.
So I went to see Mr. Fujita during a break.
“I want to ask you something.
Why do people die?”
“Well, Marie, let me first explain to you about our bodies.
Have you heard of cells?”
“Mr. Sato taught us about them.
Every living thing is made of cells.
My skin is really a collection of many, many very small skin cells.”
One skin cell breaks into two skin cells.
That’s how you grow.
Inside your body, new cells are always being made.”
“Yes, I am growing up.”
“But unfortunately, there is a limit to how many times cells can break into two.”
“What happens when cells can’t make new cells anymore?”
“They won’t be able to do their job well.
For example, if a cell’s job is to take out unnecessary things from someone’s body.”
“The body will be full of garbage.”
“Yes, and when that happens their body can’t stay healthy.
So they get sick and then die.”
“I wish our cells could make new cells forever.
Then we wouldn’t have to die.”
”That’s an interesting idea, Marie.
Actually, there is a type of jellyfish that makes new cells forever.
I heard a jellyfish of that kind was found and it was 500 million years old.”
“That is really old.”
“Let me tell you another fact about cells.
Our cells have a map of how to make our body.
It’s called DNA.
Exactly one half of your DNA is from your mother and the other half is from your father.”
“So I’m one half of my mother and one half of my father?”
Your child will also have one half of your DNA, Marie.
Our bodies will die but our DNA will keep living in our children and their children.”
“It’s like a relay race but the batons are DNA.”
“That’s a good way to understand it, Marie.”
I learned that life is a gift.
I’m going to take care of this wonderful gift my parents gave me.