My younger brother is being an absolute idiot. We are currently having a debate about the existence of space among other aspects of physical nature and no matter what I say he retorts with,"Space is an idea. We take up space and that space is gone." RUBBISH. I tell him that ideas don't physically exist and that they are merely things used by the human mind to express thoughts and whatnot. His idiocy doesn't appear to support such a claim. I ask,"We exist right?" He says,"Yes." I ask,"Space exists right?" He says,"Yes." Then I say,"If space is an idea and ideas exist only within human minds, wouldn't that mean that we don't exist?" His reply was,"NO! We take up space so that space no longer exists but we still exist." In anger at his stupidity, I state that there is space between atoms that make us. He just shakes his little used head and says that I just don't understand. That imbecile doesn't seem to want to wrap his head around the subject whist stating that he understands more about the nature of space and time more that I do. Infuriated, I decided to find someone educated about the subject of conversation and came to this forum in search of that one that can prove this fool wrong. The answer is so obvious but I can't find a way to correctly explain to him why he's wrong. Thank you for reading my little rant and for providing an answer if you can and sorry for the amount of the berating of my younger brother, but he really is an idiot.