“I found that all space is curved, but the curvature is very weak!”The old man said.
“Curved?”Jiang Fei was a little confused.
“Yes!”The old man nodded, then, he said to Jiang Fei, “Nothing in this world is absolute. The so-called straight line does not exist. Any line, plane, and space are all curved. The only difference is that the curvature is very small, so small that ordinary people can not feel it.”
“Even if everything is curved, so what?”Jiang Fei asked.
“Have you ever thought about it? If a straight line is slightly curved, what will it look like in the end?”The old man asked.
“HMM...”Jiang Fei pondered for a moment and then answered tentatively, “Then it will eventually return to its original point and form a circle?”
