@urizenus, I understand that there are a lot of things to be known and that what we actually mean by "known" is also unknown. For example, knowing something means to get till the roots and once we get to that point, there has to be the end of science and then that's where philosophy comes into the picture. For example, knowing about dogs doesn't actually mean to 'know' the breed or name of that dog but to understand the importance of their existence or the origin of their existence.
Definitely, knowing things should start from simpler things. And to know what it means to know anything at all. :)