None_Provided

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Toss a pebble in a pond -see the ripples? Now drop two

close together. Look at what happens when the two sets

-you get a new wave! When a crest and a trough

the water goes flat. When two crests

crest. When two troughs collide, they make a single, deeper trough.

just found a key to understanding how a

do waves in a pond have to do with those

amazing three-dimensional pictures? How do waves make a hologram look

It all starts with light. Without it,

much like the ripples in a pond, light travels in

you look at, say, an apple, what you really see are the

light reflected from it. Your two eyes each see a slightly

different view of the apple. These different views tell you

apple's depth -its form and where it sits in relation

Your brain processes this information so that

rest of the world, in 3-D. You can look around objects, too -if the

an orange behind it, you can just move

laser light waves are uniform and in step. When two laser beams

little more than a fascinating idea

One calculation holds that by using holograms, the U. S. Library of

"Normal" white light from the sun or a lightbulb is a

is a mass of dark and light swirls-it doesn't

between city skyscrapers and since they can bend

through your car windows to bake you

Approximate Word count = 994
Approximate Pages = 4 (250 words per page double spaced)

Category: Miscellaneous

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