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In fact, Roman latrines and baths retain signs of many of the diseases and parasites that their hygiene methods ought to have washed away. One explanation: After "bombing at the forum," the Romans passed around a shared sponge on a stick to clean their "Appian Way" - not the most hygienic option. The secrets of this neat-looking metal-making technology have been lost to history. It's an old story: You're hanging out with your blacksmith, metallurgist and weapon-enthusiast friends and you've run out of things to argue about. Sure enough, someone brings up the legendary metal weapons once traded in medieval Damascus, famed for their supposedly irreproducible strength, edge and wave pattern. One friend hammers on about how "damascened" steel is no lost secret metal or technique, but merely a method of billet welding, in which different metals are fused, drawn and folded to create a wave pattern. Another defends to the hilt the view that these fabled blades were truly unique. We know that diet plays a huge role in controlling methane levels in cows. The more digestible the feed, the less methane is burped back up. But researchers are also tinkering with chemical additives that inhibit methane production. In a recent issue of the Proceedings of the National Academy of Sciences, researchers from Penn State University published impressive results using the feed additive 3-nitrooxypropanol (3NOP), which not only decreased methane emissions by 30 percent, but also increased the cows' body weight by 80 percent on average over the control group. All this in a 12-week period. Which left us with an interesting question: How the heck do you measure how much methane is in a cow burp? Time for a chat with Patrick Zimmerman, veteran environmental scientist and inventor of GreenFeed, a nifty emissions monitoring device engineered for animals. Here's how it works. GreenFeed is basically an automated feeder equipped with a fume hood armed with 18 separate sensors. pelicula contagio

















































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