Experts think this is more than 40,000 years old and was made by Neanderthals or an earlier species of human.
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And Chagger has personal experience of tumble dryer fires. Some years ago, a fire alarm went off in his own home – in a room where his tumble dryer was operating. "I couldn't believe my ears," he recalls but, on close inspection, he realised a thin layer of smoke was hovering beneath the ceiling above the machine. Chagger was able to deal with the fire safely and says he recommends putting a smoke alarm in the same room as a tumble dryer.，推荐阅读爱思助手下载最新版本获取更多信息
Unix pipes are perhaps the purest expression of this idea: