At night, the neon of the city has long faded, and the sky is full of stars dotted in the dark night sky......

Xiao Ai tossed and turned in bed and couldn't sleep. Professor Lin's words kept her awake.

Luckily, she got up, opened the curtains, and breathed in the fresh night air, which allowed her to calm down.

She looked up at the bright moon, the moonlight illuminated the ground a layer of silver, tall buildings, streets, grass and trees, not as realistic as in the daytime. The soft, ethereal moonlight, like a soft net, envelops the entire city, making people dreamlike......

Xiao Ai felt the coolness of a night breeze, pulling her back from the unreal to reality. She put on her pajamas, picked up the key that was in the drawer, and looked at it by the moonlight......

I thought: This is not a simple key, the age, material and use are all a mystery, it is better to show it to Dad to identify, after all, Dad is a physics professor in the university, he should have a way to know a thing or two!

Another cool breeze made the curtains swing slightly. At this moment, she felt very helpless and lonely, and she wanted to find someone to talk to, and picked up her phone, but no one could relieve her boredom. I opened WeChat, swiped the address book, and thought that everyone would fall asleep, so I gave up.

The more Xiao Ai thought about it, the more confused she became, she closed the curtains and half lay on the bed. However, at this moment, Zhou Yizhi's handsome appearance emerged from his mind again. It's impossible to fall in love with him, but why do you always think of him?

Xiao Ai gently tapped the door of her head with her fist so that she would not be cranky. Feeling overloaded in her brain, she took a sleeping pill and slowly fell asleep......

The next afternoon, Xiao Ai, who was working in the library, suddenly received a call from her father, whose voice was very urgent and excited, telling her to come to his office quickly.

Xiao Ai took three steps and made two steps, and hurriedly walked into the office.

I saw Professor Su, and said excitedly, "Daughter, where did you get this thing?" ”

"I bought it at a thrift stall, what's wrong?" Xiao Ai asked curiously.

Professor Su trembled excitedly with the key in his hand, and said excitedly: "This ...... This key is alive! ”

"Alive!" Xiao Ai's eyes widened, and he said with an expression that was difficult to attach: "What does this mean, how to understand it?" ”

"It's hard for me to explain to you, but after my carbon-14 measurements, this thing is more than 2,700 years old, and it is estimated that it was born in the Spring and Autumn period. Moreover, it is composed of 80% iron, beauty, nickel, 10% gold, and I don't know what metal it is, there is no such metal on the earth, and there is no chemical element at all! The more Professor Lin spoke, the more excited he became.

Xiao Ai wondered: "Born?" It's not human! Xiao Ai couldn't help but laugh and said, "That is an alien left on the earth, did you forget to take it back?" What does that mean? ”

"To be alive is to be alive, and it is alive!" Professor Su's eyebrows fluttered.

Xiao Ai picked up the key, looked at it carefully, checked it again, frowned, and said, "It doesn't have a heartbeat, it doesn't move?" How can it be alive! ”

"Our understanding of living is only at our current level of science, and this thing has broken the definition of living on Earth! Professor Su couldn't help but say with joy.

"Dad, do you know what this thing is for?" Little Ai Dao.

"This ...... I...... I really don't know. Professor Su was embarrassed.

Xiao Ai thought that he wanted to solve the mystery of the key, but there were more and more puzzles, and they became more and more bizarre!

Xiao Ai held the key tightly and said, "Now, maybe you can only know the answer by looking for Professor Lin......