-
Random Facts
- Is There Really a Loch Ness Monster?
- What Is the Stupidest Animal That Ever Lived?
- Why does a Bridge over the Reuss River In Switzerland have the “Dance of Death”?
- How do I find out how much I weigh on another planet like Jupiter?
- What Is Tapioca Made From?
- What Is Most Intelligent Animal In The World?
- How Did the Dog Become Man’s Best Friend?
- What Ice-Skating Race Is 124 Miles Long?
- Who were the first people to fly in a balloon?
- How long does it take for water to be recycled through evaporation and precipitation?
-
Recent Comments
- chris on Who Invented Chewing Gum?
- mary on History of Umbrellas
- Abel Robinault on How Does a Clam Eat?
- chakaloso on How Does a Radio Work?
- natalie amaya on History of Shoes
- genessia on Who Invented the First Computer?
- Pop on Which Country Makes The Most Movies?
- Deedee on Why Did the Indians Sell Manhattan Island for Only $24?
- maggie on What Is Color Blindness?
- lilly on Can Any Plants Move from Place to Place?
-
Tags
-
-
Pages
How Sharp Are Your Eyes?
Your eyes are probably the most sensitive optical instruments ever invented, by man or by nature.
In good light, your eyes can tell the difference between some 10 million colors! The best machines can recognize only four million.
From ten inches away, you could see an object just 4/1000 of an inch long. And in some cases, a person can see light shining through a hole only 1/6000 of an inch across!
Some people with very good vision can recognize faces from more than a mile away!