_Undo_ Every day we hear about some new inventions, openings and so on. But what if we have an opportunity to uninvent something, what will it be? I think that not everything that scientists discover is relly good and necessary. Something could bring big troubles in our life. First of all, for me it is a weapon. Just imagine, what would have happened if there hadn't been a weapon in the world. We wouldn't have had wars, thousands of deaths and crippled lives. How many people died from such conflicts, from unnecessary fights, from ambitions of foolish persons, who just wanted to be an emperor of the world. Is it worth it? Is this power better than calm life, without troubles and disasters? Of course, you can think what hunters would do if there wasn't any weapon. I think it is only one reason for a weapon to be created for. Though, even in this case, people manage to bring troubles to nature. Another thing is sweets. If they hadn't been invented, I wouldn't have been so addicted to them. Of course, I am just kidding, but I think it will be nice if I have an opportunity to forget about sweets, chocolates and cookies for a while, till I will lose several extra kilos. Also, I think it will be good if we can undo plastic bags. As we all know, they bring a bad damage to the Earth, because they are decomposing in the ground for thousands of years. If people hadn't invented plastic bags, we might have had more pure nature, more pure ground and water. How ugly look places polluted with this garbage and how suffer some animals from this. We have enormous trash dumps, which take thousands of square meters all over the world. They are not going to diminish because, as I have already said, plastic almost cannot be decomposed. people could have used these territories for other, more pleasant purposes. What could replace plastic, if it didn't exist? Some packages can be replaced by paper, which then should be recycled of course because deforestation is also a big problem nowadays. So, of course, it is impossible to change these things and undo something, but we could try to change these things for better by ourselves. Let's try to reuse plastic bags and help to nature and as some motto said: "Make love not war".