William Gurstelle has a knack for building highly kinetic things. He often explores subjects that seem dangerous from a distance—like cannons and catapults—but are safe so long as you understand the science.
via Lifehacker http://ift.tt/2eSHppn
William Gurstelle has a knack for building highly kinetic things. He often explores subjects that seem dangerous from a distance—like cannons and catapults—but are safe so long as you understand the science.
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