It is common knowledge that we are all the same, just as it was common knowledge that the earth was flat a few 100 years ago. People don't argue for common kno

It is common knowledge that we are all the same, just as it was common knowledge that the earth was flat a few 100 years ago. People don't argue for common knowledge, it is common knowledge. Here is a interesting case: https://www.youtube.com/watch?v=cVaTc15plVs https://www.youtube.com/watch?v=cVaTc15plVs