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Add delete change searchBirthday paradox is that if a room with 23 or 23 more people, then at least two people have the same birthday is greater than 50% probability. This means that in a typical standard primary school classes (30 people), there is a higher likelihood they have the same birthday. For 60 or more people, this probability is greater than 99%. From the perspective of logical contradiction caused birthday paradox is not a paradox, math facts from this conflict with the general intuitive sense, it can be called a paradox. Most people would think that 23 people have the same birthday as the probability of two people should be far less than 50%. Calculate the probability associated with this problem is known as birthday, on this issue after the mathematical theory has been used to design the famous password attack methods: birthday attack before the birthday paradox in understanding the need to understand is: a real-world population, date of birth is not evenly distributed and the military NASA scientists recently said that they recently through the analysis concluded that even with today's most advanced rocket propulsion theory, technology, human beings in their life cycle and can not log in extrasolar any stars. That is to say, the human dream of flying out of the solar system is almost never become a reality recently, in the United States Hartford City, at a joint meeting propulsion technologies from NASA and the U.S. Air Force missile experts on human interstellar travel dreams poured cold water. Assembly received more specifically for Star Trek rocket-propelled advanced technology design. These designs scientists conducted a professional, detailed analysis and calculation, reached a depressing conclusion. To the human life cycle landing nearest extrasolar planet, theoretically even with today's most advanced rocket propulsion technology, this dream is almost impossible to achieve. In essence, human beings He Shifei the solar system is not a matter of time, but the speed of development of human science and technology and the level of the problem. In other words, human beings are flying out of science and technology can not meet the requirements of the solar system MIT Assistant Professor Paul Provenzano Rolls-Royce Aerospace is one of the experts participating. Paul believes that Star Trek is a complex engineering problems, it was impossible to imagine the difficulty of the project. One of the biggest problem is the rocket propulsion issues, including the duration of the problem as well as power fuel problems. For example, using the most advanced current human rocket engines, in theory, still need five million years to reach Alpha Centauri. Alpha Centauri is the nearest planet from the solar system. According to NASA's Jet Propulsion Laboratory scientist Robert Frisbie introduction, if we adopt the most effective way forward in theory, that is ideal antimatter engine power, but also still take decades to reach Alpha Centauri current understanding of human Aerospace technology is still far from flying out of the solar system can not meet the needs. For example, given the broad cosmic scale, even though the spacecraft's speed can reach the speed of light, but from the sun to the nearest star Proxima Centauri fly back and forth, still needs nearly 10 years, the galaxy needs to turn around several hundred thousand years, to fly the Milky Way, the Andromeda galaxy to the nearest, you need more than 230 million years, but to travel in the universe, you need a few hundred million years of time. Currently, people hope the speed of Einstein's relativity effect, that spaceship flying at high speed, the time will be expanded, will shorten the distance, the closer the speed of light, the speed effect is more significant to the infinitely close to the speed of light, the time is almost stagnant, the size of several close to zero. In addition to current human science and technology, the same can not solve the problem of rocket fuel, an assistant professor at Rensselaer Polytechnic Institute Bristol American ska Ossetia analysis, in order to use the rocket to Alpha Centauri to send a probe, at least to consume the Earth all the energy has been output. This is a very alarming huge numbers. What is more, this idea if you really want to put into practice, the actual energy consumption may be much higher than the estimated 100 times. Human beings can not really go to extract all resources to achieve the earth distant interstellar travel. In the coming decades, the human race is mainly carried out some relatively viable aviation activities, such as establishing a permanent manned space station, space shuttles develop inexpensive high-energy transport systems and spacecraft power system, the establishment of a permanent lunar base, development lunar resources currently fly in space farthest human civilization messenger U.S. Voyager 1 detector, is to approximate the solar system boundary. Even some scientists believe that it may have been exceeded once outside the solar system and interstellar space, the first boundary line. But frankly speaking, they can not be said to be human flight distance, because they are not manned flight. Real human farthest flight distance, which is manned spacecraft to the most remote, and only so far from the Earth to the Moon is about 384,000 kilometers, a record that still in the sixties and seventies of the last century created so far failed to break. This record is the creator of Apollo spacecraft and its crew manned lunar landing. The reader can see the network in LiuXiang own judgment decision after the game immediately exploded, suspicions have various versions. Although it may not be, but as NIKE China marketing headquarters insider, I decided to expose some of the secrets may never! ! !Since winning the gold medal LiuXiang OY, especially after breaking the world record 12.88, commercial activity is more frequent. Our company, VISA, Amway, etc., advertisement, announcement, activities have been had not broken. His coach SunHaiPing very unhappy with this fact on several occasions on LiuXiang economic protested, saying that speaking on LiuXiang have very serious negative effects, which is not affected when the hold state. In the face of huge economic benefits, LiuXiang economic man team did not engage in sports for the elderly on a compromise. So we saw LiuXiang attend one after another commercial activity, appeared one after another ad. . . . . . (Of course, we also have one kind NIKE credit)In fact, back in early 2008, LiuXiang results have been far less than it won that year's time, the state also deteriorated. Many times he can only carry out a gap in the commercial activities of some sporadic training, it can not be said that the system of exercises. At that time his economic team's hope is that people in the last three months time (OY ago) closed at the beginning of training, with LiuXiang ability should be able to get back the state. At this time we actually have seen the Cuban teenager Luo Busi amazing performances, SunHaiPing this can only shake their heads, because as a coach, his entire economic team where there is no right to speak. At a time when LiuXiang nor in huge economic benefits foreground head, he chose to accept. In fact, this can also be understood that China's many athletes so hard, the most fundamental is the huge economic interests after the famous temptation. He also believes that they have the ability to catch up in the last few months and then in the heyday of the Luo Busi never expected, due to the long neglect of training, physical function has been unable to meet the demands of the game LiuXiang large amount of exercise, and direct The consequence is that we see later in the United States Grand Prix LiuXiang accidental injuries. The duo hit Liu Sun is actually quite large, because it upset LiuXiang after all the arrangements. Have signed a commercial activity is no way to dodge the contract, should be fully recovered from his wounds at the time he was no way to do go all out, had to continue filming of advertising, the announcement. Originally convalesce the time the sacrifice, not to mention the trained here have to mention LiuXiang sponsors play in which the negative effects. In fact, foreigners and Chinese people, sighted it is very shortsighted. They also have had complete indicators. You know that in LiuXiang allowed to continue after the announcement injury will directly affect LiuXiang in OY achievements, but the pressure of money so that they (of course, including our company) are still lined LiuXiang schedule. In fact, we have no choice, do not look at America's top star of the injury is, they only care about their sales performance and figures. As a Chinese person, although not the heart, but in order to protect their jobs, we can only follow suit. Even if we do not, others will do until later OY start, LiuXiang team found that although he was a good hurt, but his status is far less than OY medal requirements. As a sponsor (which we NIKE as the most important, because the seats sports company, the greatest impact). We will be in big games before and star athletes to communicate, to see athletes in the race results are expected to develop our plan for the subsequent renewal (OY when we won the gold medal in LiuXiang signed up before that was conducive to this policy). But when we learned that Liu's status will definitely miss the gold medal, and this message is reported to the United States, high-rise had a rude awakening, the same day video conference LiuXiang economic team. Because if LiuXiang not defending (or medal), his value will certainly shrunk dramatically, and Liu before we will have a huge endorsement fees may not get anything in return. Contract is a contract, we can not breach of contract, our company can only find a solution to minimize the loss of the original program is hoping to reduce LiuXiang endorsement fees, this proposal was LiuXiang team immediately rejected because they grip the contract, They do not want to compromise. There are probably a few weeks after the stalemate, both sides refused to budge. Meanwhile there are news reports about LiuXiang state recovery, in fact, we know that this is LiuXiang team strategy because they are in the media, including the government, there are a lot of contacts, LiuXiang is included in the income of many Sports General Administration, these reports it is not difficult understand. For companies entering China for many years, and we are then familiar. We can not ignore the breaking of the deadlock appeared in an American made a terrible plan: to injury for the reason to retire. Reasons are: one can keep LiuXiang face, two as a sponsor, we will not be much loss because athletes because of unpredictable injuries withdraw from the competition, it will greatly reduce the failure medal in the minds of consumers produced no identity, even if subsequent state recovery in the medal, we can have more publicity Click the program seems to be everyone's affirmation, and soon the two sides reached a consensus and start up we saw the news director. Including previews timing of reports and retired from the race. . . . . In fact, after the game coach SunHaiPing tears from the heart. In my opinion, he really cherish, really sorry for such a genius in the power of money before the fall. But he really powerless LiuXiang, just before the power of money and a fallen star in an N number only. . . . . . I wish he would be the last one.
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