If you have the opportunity check out the drilling episode of the History channel series Modern Marvels. I watched it while I was home sick last week but they re-air old episodes all of the time. They cover the invention of the drill bit, Black and Deckers revolutionary handheld version, the drilling of the seven mile hole in Russia and new laser drilling techniques that are the key to unlocking the potential of geothermal. They also talk about sideways drilling (used in Oil and water), good stuff.
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