“Knock, knock,” a knock on the door sounded as Anna sat in the lab, looking at the computer screen.

The door opened and the director of the research institute walked in. Seeing her, he asked in surprise, “Mrs. Turner, it’s the weekend and you’re still coming to work?”

“Yes, I want to make sure everything is perfect,” she replied with a smile.

Actually, she felt a little uneasy. They were going to introduce the time machine at the party tonight, which more or less reminded her ...