To get you started try this, but as noted try google next time.
http://www.airspacemag.com/military-...on/ravens.html
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Hold Hard guys
Rick B.
Knowledge is knowing a tomato is a fruit.
Wisdom is knowing it is great on a hamburger but not so great sticking one up your ass.
Author - Richard. 
Experience is what you get right after you need it.
Author unknown. 
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