Here's a just a few natural phenomena to be thankful for, because, without them, we would not exist:
More at Cellular Visions: The Inner Life of a Cell
(Here's one explanation of the events depicted above. Hat tip Mark H in comments.)
Cat's Eye Nebula (Enlarge)
Hubble Ultra Deep Field View (Enlarge)
Lunar Dawn by Karen Wehrstein
And I'm thankful for you, the members and readers of Daily Kos. Because without you, my mostly sane state of mind might not exist.
This is a Science and Holiday open thread. Don't blow too much green cash on those black Friday purchases!