This is even more amazing:
A long time ago, when I was still using Win98, once my system crashed. Since I was a computer novice, my friend introduced a expert to help me fix the computer.
He looked at the computer and asked me if I had a 98 disk. I said I didn't.
He thought for a while and told me to give him the hard drive. So I unplugged the hard drive and gave it to him.
He opened the hard drive and then drew circles on it, using a magnet. He drew very fast, but sometimes he touched it and sometimes he didn't. I didn't understand what this was for, but I didn't dare to ask. After watching for more than half an hour, he kept drawing circles. I gradually got a little sleepy. I asked him how long this would take. He said it would take more than ten hours. I poured him a cup of tea and then went to sleep next door alone.
When I woke up, I saw that more than 12 hours had passed. I got up and went to the next door and saw him debugging in a system that looked very much like 98. After a while, he said, "You try it." I sat on the chair and used it. It really worked. I didn't understand computers at that time, thanked him and left.
Later, I gradually learned more about computers and finally understood that the expert at that time directly used a magnet to modify the position of iron oxide particles and compiled a system. Later, I asked my friend about the expert's whereabouts. My friend said that he went to the future a few years ago and has been lost...
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