Where is the limit?

The world is changing very quickly and we don’t know it. Humans have go to the space, they are people that can run 100 meters in only nine seconds, people who can push up more that four hundred kg and people who can run without his legs! In youtube there are a lot of videos of a group with the title People are awesome, and that’s right. There are crazy people that do impossible things, but we have to recognize that these people are the best. I don’t remember the film, but when I listened this sentence I thought that’s right, the crazy people are the one that when they want to do something, they only do it, that’s all. So where is the limit? I saw a sentence that says: Don’t tell me the sky is the limit if there are footsteps in the moon. So if you are thinking that there are impossible things in life, maybe after watching this video your opinion change.