JMJ, thank you for keeping this fascinating thread on track. What these self appointed sceptics forget is that scepticism should be applied equally to all, including their beloved religious faith of modern age science itself, its precepts, foundations and "findings". Think Margaret Mead, if you can't bring yourself to think Carl Sagan or global warming or nuclear winter. Science! Phew!
I believe...
How does one explain why the blood sometimes forms tiny bubblets that rise to the surface and collect into foam? Or why, when it bubbles, it becomes a crimson color, while at other times the color of the liquified material is dull and sluggish in movement.
So far as I know, there has been [to date] no scientific explanation of the phenomenon.