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Plate Tectonics

In geologic terms, a plate is a large, rigid slab of solid rock. The word tectonics comes from the Greek root 'to build.' Putting these two words together, we get the term plate tectonics, which refers to how the Earth's surface is built of plates. The theory of plate tectonics states that the Earth's outermost layer is fragmented into a dozen or ...

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PlateTectonics
Biology

Batesian Mimicry

If you ever got stung by a wasp you would probably avoid all flying insects which resemble the brightly-colored yellow and black wasp. If you were a bird and certain types of butterflies gave you a ... Continue reading

BatesianMimicry
Engineering

The Night Orville Wright Had Too Many Cups Of Coffee

Whenever Wilbur and Orville Wright's colleague, George Spratt, visited their Kitty Hawk glider test camp, lively discussions and arguments on flight persisted until late in the evening. On this ... Continue reading

OrvilleWright
Medicine

What Is Sickle Cell Anemia?

Sickle cell anemia is an inherited blood disease. That means you are born with it and it lasts a lifetime. Sickle cell anemia affects the red blood cells. Normal red blood cells are smooth and round ... Continue reading

WhatIsSickleCellAnemia
Engineering

What Are Composite Materials?

A composite material is one in which two or more separate materials have been combined to make a single construct having more desirable properties. What many people don't realize is that composites ... Continue reading

CompositeMaterials

GP-B: More Than Just a Pretty Face

GPBMoreThanJustaPrettyFaceQuestions about the ways space, time, light and gravity relate to each other have been asked for eons. Theories have been offered, yet many puzzles remain to be solved. No spacecraft ever built has required such extreme demands on technology and testing. Scientists and engineers have worked tirelessly for more than 40 years developing new technologies just for this mission. Gravity Probe B is

Also, Gravity Probe B sports the world's most spherical gyroscopes. Measuring the curvature (geodetic effect) and

GP-B was built in a class 10 clean room, so the entire craft wouldn't be subject to particles larger than a single micron that could disturb the delicate components. If Albert Einstein were alive today he'd be relaxing in his easy chair, pipe in hand, very calmly awaiting the results of this historic mission and probaby marveling at the technology it takes to probe his 89 year-old theory.