cofty you started making harsh remarks in page 5, but I understand your point.
To be honest I failed to fully understand the video when you posted it. I think if you have some evolution background it makes perfect sence to you. But as someone pointed out earlier for those of us not in your league some parts made no sense.
For example in the video he states "clearly human" and "clearly not human." And then he jumps to there is no first human. Wait what? If you can clearly tell when you have a human and when you don't why can't you use that critiria to find the first human.
I see the problem with what I suggested and I think I now understand you guys point.
The way I would try to explain it is: Any defition of human would be arbitrary. Why? Well lets say you define human and say anybody that fits that definition 98% is human. So you go back in time and find were that started to happen. Isn't the last human you pick also human so why not use his characteristics to find humans. And his parents are so but so close to his characteristic lets assum 99.99*% why stop there. i.e. what would make that defition special, what would make it better than any other definition specially when imidiate generations are almost identical. Another example lets say someone in the future formulates some definition and by that definition you are human but your parents are not. Do you see the problem of trying to make an exact definition of human.
One thing I'll apologise for is for trying to exchange insults with cofty. IMHO those type of comments you made earlier shutdown dialog, I tried to use sarcasm but that failed. We don't process info at the same rate specially if you know more about a topic so I am sorry I made personal attacks.
Thank you for the list by the way.