Trivia
HardThe Floating Dots You See When Looking Up At A Clear Blue Sky Are?

Answer: White Blood Cells
It’s formally known as the “blue field entoptic phenomenon” (a.k.a. Scheerer’s phenomenon) and it’s a curiosity to children and adults alike. When you stare up at a clear blue sky (or any other bright uniform blue surface), you see little glowing dots moving quickly across your field of vision.
What exactly are those little bright dots? The explanation is just as curious as the phenomenon. When you see the little bright dots, you’re seeing white blood cells moving through the capillaries in front of your retina. Your eyes and brain do a marvelous job of editing out, if you will, the shadow lines of the capillaries so that your vision is clear and crisp. However, under very specific circumstances (conditions), the editing process fails and little artifacts appear in your vision.
The blue field entoptic phenomenon is one of those situations (the larger size of the white blood cells compared to your red blood cells as well as their rarity, combined with the blue light which is absorbed better by the red blood cells than the white) that allows you to actually see your white blood cells drifting on by.
Trivia
HardThe Design Of Which Of These Common Office Objects Was Directly Influenced By The Quakers?
Trivia
EasyThe Mast Of The Empire State Building Was Originally To Serve As What?
Trivia
HardThe Point On The Earth’s Surface Farthest From Its Center Is Located At?
Trivia
HardWhich State Contains Both The Highest And Lowest Point In The Contiguous United States?
Trivia
HardThe First Person To Be Honored With A Hollywood Walk Of Fame Star For Live Performances Was?
Trivia
HardThe Comet Lovejoy Is Notable For Leaving A Trail Of?
Trivia
Very HardWhich Movie Character Was Allergic To His Costume?
Trivia
Very HardThe First Toilet Shown On Television Appeared In An Episode Of?
Trivia
EasyThe Plumbing Traps Found In Sinks, Toilets, And Other Drain-Connected Items Are Intended To?