That's why they teach algebra in school, but not things you can't do without in life? After all, in not a single lesson will you hear: “Children’s time is not a toy! Therefore, guys, if you see a time machine (or, at worst, a cart) on the street, quietly pass by. Otherwise, Big Trouble awaits you. For example, you can accidentally meet your own grandfather in short pants, and he will tease you to tears. Or you will be mistaken for a spy and shot. Or you will be stuck for the rest of your life in the Old Times, when chips weren’t even invented yet.” It never occurs to anyone to warn about this. But if, due to careless handling of Time, the Universe explodes, who will be to blame? That's right, Johnny Maxwell. But he just wanted to write an essay on history. Well, maybe change this story a little...