Matt: My solar-powered calculator. How long will it last? Is it a perpetual-motion machine that will go on calculating into the next millennium? Does it have any parts that will die off like any ordinary …
September 30, 2009
Posted September 30, 2009
Matt: My solar-powered calculator. How long will it last? Is it a perpetual-motion machine that will go on calculating into the next millennium? Does it have any parts that will die off like any ordinary …