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There, in the year 673, true Greek fire - petroleum-based, self-lighting and impervious to water quenching - was said to have been used to devastating effect by Byzantine emperor Constantine IV's forces against an attacking Arab fleet. Oh, well - that's the problem with taking state secrets to your grave. Watching an aeolipile do its work was the equivalent of a Netflix binge back in the day. In the Tom Stoppard play "Rosencrantz and Guildenstern Are Dead," dimwitted Rosencrantz repeatedly stumbles onto notable scientific and technical discoveries, often via toys (neither he nor Guildenstern grasp what he's done). These droll scenes raise a thorny question: Do you have to recognize a thing's operational principle to lay claim to discovering it? Should we credit the inventor of a steam-driven toy with the discovery of steam power? Whatever your answer, there's no question that the aeolipile, a toy devised in the first century by inventor Heron of Alexandria, was a steam turbine - a device that turns the thermal energy of escaping steam into mechanical energy.|Michael Phelps crushed the competition at the 2008 Beijing games. But how? See more Olympic pictures. Sweat dripping off the forehead, water cascading from the body, legs aching after the exertion. All may occur during the sort of intense, physical toils Olympians undergo to prepare for their events. Plus, do we even need to mention the multiple daily workouts, diet scrutiny and absurdly early wakeups? And yet, years of hard training can prove itself in a window of mere seconds, mere inches or mere pounds, depending on the event. But many Olympic athletes have an edge over the rest of us, and over some of their competition, too. That's because a lot of factors can influence an athlete's success -- some inborn, some acquired. Take Michael Phelps. There's been a lot of speculation about how he managed to win an unprecedented eight gold medals at the 2008 Beijing games. But others think it's purely a matter of relentless training and skill refinement. The fact that heiress and socialite Luisa Casati was buried with her taxidermic toy dog, wearing false eyelashes and a leopard-trimmed cape, can tell you a lot about her eccentric, yet troubled, life. Stuff You Missed in History hosts Tracy. Holly step into the world of the Marchesa in a recent episode of the podcast. Among their discoveries were streets, monuments and tanks that were likely used to produce a fishy condiment. Read more about why the discovery was so significant in this article. Denmark gets a lot of props for being one of the world's "happiest countries." If you're not quite sure how one could measure happiness, check out this article to find out why Danes live so joyously. OK, minivans aren't exactly visions of luxury and speed, but they are pretty darn efficient and roomy. And as a new article (and CarStuff episode) details, the boxy vehicles have a surprisingly innovative history. Follow along as writer Kate Kershner presents three supercool facts about minivans here. cuales son los continentes
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