A new international study shows that some people's biological clock plays a powerful role for their life expectancy, regardless of lifestyle choices.

    Published in the latest issue of Aging on Wednesday, the study has found the most definitive evidence to explain why some people keep healthy lifestyle but die younger than others.

    Geneticist Steve Horvath from the University of California, Los Angeles (UCLA), led a team of 65 scientists around the world to record age-related changes to human DNA, analyse blood samples collected from 13, 000 people and estimate their lifespan.

    A higher biological age, regardless of actual age, consistently predicts an earlier death, the study says.

    "You get people who are vegan, sleep 10 hours a day, have a low-stress job, and still end up dying young," Horvath said in a statement. "We have shown some people have a faster innate aging rate."

    The findings discovered that 5 percent of the population ages at a faster biological rate, which translated to a roughly 50 percent higher than average risk of death at any age.

    "The great hope is that we find anti-aging interventions that would slow your innate aging rate," Horvath said, adding that "this is an important milestone to realizing this dream."

    Rome wasn't built in a day, and the Internet didn't come out of a golden egg. Many of today's creations were not born of people who had creative ideas, but who did not stop at simply having an idea. They took one brick of capital (资本), another brick of knowledge, perhaps a brick or two of family and friends, and built their empires (帝国) brick by brick.

    If you want to build an online empire, you cannot settle for simply having a website full of articles, or a website full of pictures—there are already thousands of sites like that, so you need to come up with something new and creative.

    So if you are starting to build something up, ask yourself: what do you really want to do, and what are you really good at? Believe it or not, you can make money at something that you are an expert in, and you need to know what that is.

    Remember, having an online empire does not mean that you have to do it alone. You can take your friends along with you. Having a friend advertise your services online is a good way to attract more visitors to your empire.

    Building an online empire, you will have to be prepared to not only come up with creative ideas, but to carry your ideas through. Talk to people who have already succeeded in building their own empires. Talk to people who are struggling. Join a mailing list that will help you get through your struggle to achieve your goal.

    As you move forward, you will find that you can help other people, and you will have a good many stories to tell—not to mention a lot of money in the bank.

    If you learn the real secrets of creating a long term stable (稳定的) online business then you will have enough money to retire on.

    The loud continuous noise of the cars or the sound of a plane can force its way into the deepest forest, yet it's not only humans that ere bothered by the noise.

    Bioacoustician Bernie Krause has been studying the effect of noise pollution on wildlife, and has come across some interesting behaviors, especially among animals that communicate by vocalization（发声）, like humans. Birds use sound to communicate, but in noisy places, these animals have to shout over the natural noise to be heard.

    Krause mentions a study of nightingales to clarify what he means. The birds responded to traffic noise by singing louder and louder until they actually went beyond noise pollution standards in the city. To belt out (sing loudly) their songs, they increased their lung pressure fivefold, but scientists state that this is not dangerous for the birds themselves.

    Studies show that sudden noise can cause certain birds to leave their nests, exposing the young to their enemies. One study also showed that songbirds that nested close to busy motorways were much less productive than those that nested farther away. Mammals（哺乳动物）too are affected. A recent study showed that nursing caribou responded to plane noise by not producing enough milk to feed their young.

    In some cases noise pollution can actually help some animals while harming others. Toads（蟾蜍）and frogs are known to vocalize in synchrony（同步；同步方式）so that no predator (their enemies) can zero in on them. Krause found that when planes flew overhead and disturbed the toad's song, they lost their synchronicity, and it took them 45 minutes to get it back again. That gave their natural enemies plenty of time to find and catch individual toads by sound.

    According to Kruse, “Not only will noise pollution bother wildlife, but it won't help our lives either.”

What Cocktail Parties Teach Us

    You're at a party. Music is playing. Glasses are clinking. Dozens of conversations are driving up the decibel (分贝) level. Yet among all those distractions, you can tune your attention to just one voice from many. This ability is what researchers call the “cocktail-party effect”.

    Scientists at the University of California in San Francisco have found where that sound-editing process occurs in the brain — in the auditory cortex (听觉皮层) just behind the ear, not in areas of higher thought. The auditory cortex boosts some sounds and turns down others so that when the signal reaches the higher brain, “it's as if only one person was speaking alone,” says investigator Edward Chang.

    These findings, published in the journal Nature last week, explain why people aren't very good at multitasking — our brains are wired for “selective attention” and can focus on only one thing at a time. That inborn ability has helped humans survive in a world buzzing with visual and auditory stimulation (刺激). But we keep trying to push the limits with multitasking, sometimes with tragic (悲剧的) consequences. Drivers talking on cellphones, for example, are four times as likely to get into traffic accidents as those who aren't.

    Many of those accidents are due to “inattentional blindness”, in which people can, in effect, turn a blind eye to things they aren't focusing on. The more attention a task demands, the less attention we can pay to other things in our field of vision. Images land on our retinas (视网膜) and are either boosted or played down in the visual cortex before being passed to the brain, just as the auditory cortex filters sounds, as shown in the Nature study last week. “It's a push-pull relationship — the more we focus on one thing, the less we can focus on others,” says Diane M. Beck, an associate professor of psychology at the University of Illinois.

    Studies over the past decade at the University of Utah show that drivers talking on hands-free cellphones are just as influenced as those on hands-held phones because it is the conversation, not the device, that is distracting their attention. Those talking on any kind of cellphone react more slowly and miss more traffic signals than other motorists.

    Some people can train themselves to pay extra attention to things that are important — like police officers learn to scan crowds for faces and conductors can listen for individual instruments within the orchestra as a whole. Many more think they can effectively multitask, but are actually shifting their attention rapidly between two things and not getting the full effect of either, experts say.

    Elephants are able to know the difference between a man and a woman, and can tell an adult (成年人) from a child—all from the sound of a human voice. This is according to a study in which researchers played voice recordings to wild African elephants.

    The animals showed more fear when they heard the voices of adult Masai men. Usually Masai people hunt elephants, and this suggests that animals have grown to listen for and avoid them.

    Prof. Karen McComb and Dr Graeme Shannon from the University of Sussex led the study. They explained that in former research they had used similar experiments to show that elephants could tell—from the sound of a lion—whether the animal was a female (雌性) or a more dangerous male (雄性).

    Prof  McComb wanted to find out if the animals used their very sharp sense of hearing to recognize danger from humans.

    The scientists recorded Masai men, women and children saying, in their own language, "Look, look over there, a group of elephants are coming." They also recorded Kamba men saying this phrase.

    Masai people often come across elephants, which can result in violent (暴力的) hunting. Kamba people, however, mainly feed on agriculture, which does not generally bring them into violent touch with the animals.

    When the team played recordings of these different voices through a hidden speaker, they found that elephant family groups showed more fear in response to the voice of a Masai man, than to a Kamba man's voice. And the adult male Masai voices caused far more violent response than the voices of women or boys.

    Some colors people see late at night could cause signs of clinical (临床的) depression. That was the finding of a study that builds on earlier study findings. They show that individuals who live or work in low levels of light overnight can develop clinical depression. Doctors use the word "clinical depression" to describe severe form of depression. Signs may include loss of interest or pleasure in most activities, low energy levels and thoughts of death or suicide.

    In the new study American investigators designed an experiment that exposed hamsters (仓鼠) to different colors. The researchers chose hamsters because they are nocturnal which means they sleep during the day and are active at night.

    The animals were divided into four groups. One group of hamsters was kept in the dark during their night-time period. Another group was placed in front of a blue light a third group slept in front of a white light while a fourth was put in front of a red light.

    After four weeks the researchers noted how much sugary water the hamsters drank. They found that the most depressed animals drank the least amount of water.

    Randy Nelson heads the Department of Neuroscience at Ohio State University. He says animals that slept in blue and white light appeared to be the most depressed. "What we saw is that these animals didn't show any sleep uneasiness at all but they did mess up biological clock genes and they did show depressive sign while if they were in the dim (微弱) red light they did not."

    He notes that photosensitive (感光) cells in the eyes have little to do with eyesight. He says these cells send signals to the area of the brain that controls what has been called the natural sleep-wake cycle.

    He says there's a lot of blue in white light. This explains why the blue light and white light hamsters appear to be more depressed than the hamsters seeing red light or darkness.