Odpowiedź:
-I think that invention of guns was one of the biggest mistakes in history. In general, it doesen't help people defend themselves. It makes people even more dangerous, and it starts lots of wars and school shootings all over the world.
- In my humble opinion, invention of steroids was a terrble mistake. Right now, it made a lot of people insane, weak, and even some people died by these drugs. It is as well one of main reasons for pollution in our world. (feeding animals with steroids)
