B
Bodd
Should have been at the sides and the ears above the nose
B
Bodd
Ok John tell us
the human eyeball is very approximately globular, with a lens at the front throwing an image onto the retina at the back which is a lining of light- and colour-sensitive cells.
the retina is suppled with oxygen and nutrients by a network of tiny blood vessels
rather like your skin
if you look at your arm, you can hardly see the blood vessels because they are underneath the surface, behind the skin
however
the retinal blood vessels are on top of the retina, obstructing the image thrown on it. Rather as if your TV screen had ivy or cobwebs on it obstructing the image
the eyeballs are in constant movement, so you can see the image behind the obstruction, and the unconscious brain filters out the view of blood vessels.
It is possible, with your conscious brain, to see them, using techniques such as a card with a tiny hole in it, or a small torch in a darkened room. It is like looking at the roots or branches of a tree.
This is an obvious design error.
Some animals have the blood vessels behind the retina, so it works and need not have been wrongly designed.
the retina is suppled with oxygen and nutrients by a network of tiny blood vessels
rather like your skin
if you look at your arm, you can hardly see the blood vessels because they are underneath the surface, behind the skin
however
the retinal blood vessels are on top of the retina, obstructing the image thrown on it. Rather as if your TV screen had ivy or cobwebs on it obstructing the image
the eyeballs are in constant movement, so you can see the image behind the obstruction, and the unconscious brain filters out the view of blood vessels.
It is possible, with your conscious brain, to see them, using techniques such as a card with a tiny hole in it, or a small torch in a darkened room. It is like looking at the roots or branches of a tree.
This is an obvious design error.
Some animals have the blood vessels behind the retina, so it works and need not have been wrongly designed.
B
Bodd
B
Bodd
this one has fewer possible answers... but if you get it right, I will ask why.
A horse is grazing, with his head down. A predator Big Cat wishes to attack him. From which direction must he attack, so that the horse will not see him?
A horse is grazing, with his head down. A predator Big Cat wishes to attack him. From which direction must he attack, so that the horse will not see him?
B
Bodd
Directly in front
B
Bodd
From above
was that a guess?
