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　　By the growing national Occupy Wall Street movement, hundreds of protesters moved through midtown Manhattan on Tuesday．They called this “Millionaires March”．

　　They marched two by two up the sidewalk, planning to pass the homes of some of New York City’s wealthiest people．They said they didn’t have a permit and didn’t want to lead the traffic jam．

　　“No Billionaire Left Behind,” said on a card that was written by Arlene Geiger, who teaches economics at Manhattan’s John Hay College of Criminal Justice．

　　New York’s 2 percent “millionaires’ tax” will last till this December．Protesters expressed they cared about how much less the wealthy would pay and who would get less money then．Protesters have been camped out for weeks in lower Manhattan’s Zuccotti Park, near Wall Street．They say they’re fighting for the “99 percent” of Americans who do not fall into the wealthiest 1 percent of population．

　　Their causes range from bringing down Wall Street to fighting global warning．The movement gained traction through social media, and has taken place in several other cities．

　　In Boston, hundreds of college students marched through downtown Boston on Monday and gathered on Boston Common, holding signs that read “Fund education, not corporations”．The protesters were angry with the education system．They said it was like “irresponsible, unaccountable, and unethical(不道德的)financial practices” of Wall Street．

　　And now, a lot more movements have taken places in some European countries．

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　　Our listener question this week comes from Vietnam．Quang Khoi asks about Murphy’s Law．Murphy’s Law says：“Everything that can possibly go wrong will go wrong．” Like many other popular sayings, it is difficult to find one explanation for it．

　　Those trying to explain Murphy’s Law agree that it began in the United States Air Force, which says the expression was named after officer Edward Murphy．He was an engineer working on a project in space flight research in 1949．One story says Captain Murphy was commenting about the failure of some equipment he was using in an experiment．He reportedly mentioned the worker responsible by saying：“If there is a way to do it wrong, he will find it．” Another official heard this and called it Murphy’s Law．

　　Another story is found in a book called A History of Murphy’s Law by Nick Spark．It says members of the research team working with Captain Murphy created a similar phrase：“If it can happen, it will happen．” They called this Murphy’s Law．But Spark later said there are in fact many different explanations about who invented the expression．

　　Still, many stories say the first use of the term Murphy’s Law was at a press conference several weeks later．John Stapp was an Air Force captain at the time．He spoke to reporters about the tests completed by Captain Murphy and his team．Stapp said no one was injured during the tests because the Air Force considered “Murphy’s Law” before carrying out their experiments．He said this meant that they considered everything that could go wrong before a test and planned how to prevent those mistakes from happening．

　　Today, you can find examples of Murphy’s Law in everyday life．For example, you might say that if you drop a slice of buttered bread on the floor, it will always land with the buttered side down．