That thirty or so year-old teacher went up the stairs inside the second block of the sixth grade. This cla.s.sroom block was six stories high, and he brought Huo Yuhao to the fifth before they turned down a corridor. They walked down it a few dozen meters until the teacher stopped before a door.

　　There was a tag on the door that read '3rd Laboratory.'

　　He's already taking me to the lab? Huo Yuhao had some doubts in his mind when he saw where they were. However, he didn't have any control over what he was going to learn while he was here.

　　The young teacher took out a nameplate from his pocket and waved it in front of the door. A similar sight to what Huo Yuhao had seen at the measuring room yesterday presented itself—a single beam of light flashed, followed by the door opening.

　　"Come in." The young teacher's voice was simple and pithy as he led Huo Yuhao into the lab.