Although the birthday present was two weeks late, Marven was very happy to receive the gift.

What his grandparents gave Marven was a box of books. There are picture books and books to teach literacy.

Marven was very interested in the set of books that taught literacy, because he could show off the Chinese characters and English words he knew in front of his illiterate sister Mia. My sister could only look up at Marven with envy.

Another reason Marvin is interested in books that teach literacy is that they tell a lot about the universe. This universe turned out to be not only the earth where Marven and the others lived, but also the sun, moon and stars in the sky. In fact, the universe is very big.

"How big is it?" Mia asked Marven with big eyes flashing.

"Uh......" Marven couldn't explain what was written in the book to his sister, so he said, "Compared to the universe, the earth we live on is as small as a grain of sand. ”

"The earth is as small as a grain of sand? So how can you build a house, how can you live in it? Mia didn't believe it at all.

"That's my analogy." Seeing that Mia didn't understand, Marven tilted his head and continued to think about how to make his sister understand.

Grandparents are going back.

Marven was finally able to escape his sister's constant questions, so he took his sister to the underground garage to send his grandparents.

Marven also wanted to take his father's car to send his grandparents home, but his father said that after driving his grandparents, he had other things to do.

Marven had no choice but to go back to the living room to continue reading.

"Marven, come here. Mom tells you something. Mom called Marven aside.

"What's the matter? Mom. Marven put the book on the floor and walked to the table.

Mom said to Marven: "In the future, you don't want to say that grandparents are forgetful." ”

"Why? Don't you often say I'm forgetful? Marven asked.

"You're not the same as your grandparents. You're five years old, a big kid. Next, I'm going to tell you a secret, which only you know, to keep it secret from Mia. Can you do it? ”

Marven immediately straightened his waist and said seriously: "I must keep it a secret." ”

"That's good. My grandparents had a disease, a disease that easily forgets things, and the name is 'Alzheimer's'. ”

"Al......" Marven thought the name of this disease was so strange, not as simple as a cold, fever, or cough that was easy to remember.

"Alzheimer's." Mom repeated, "If you have this disease, you will slowly lose your memory, so your grandparents will forget a lot of things." ”

"Isn't it okay to go to the hospital if you're sick?" Marvin fully believes that the hospital can treat all diseases. He used to have a fever and cough that was very severe, and he would go to the hospital to see a doctor, and it only took a day or two to get cured.

"There are some diseases that cannot be cured. Ah, that's not right either. It cannot be said that the illness of grandparents cannot be cured, but it is difficult to treat. ”

Mom's words sounded awkward, but Marven knew what Mom meant.

"Okay, Mom, I got it. Grandparents are sick, so pitiful. I'll never say they are forgetful. Marven said sadly.

"That's right."

"Mom, I often forget things, so do I also get Al...... That one...... Alzheimer's disease? ”

Mom laughed, "Of course you're not." You're the one who forgets it. ”