1) What we had was not complete because sequencing happened for (relatively) small chunks. Due to overlap the sequence could be reconstructed, but not for areas

1) What we had was not complete because sequencing happened for (relatively) small chunks. Due to overlap the sequence could be reconstructed, but not for areas with a lot of repeats. 2) This incomplete sequence has nevertheless been VERY useful, because these repeats mostly are outside of protein encoding regions ('genes'). 3) 'The' human genome is of course non existent because you and I have a different one. What is meant is that this has been done for a 'bunch' of individual humans. 4) Because we're much more alike than we are different in our genome, this is still very informative.