Siri is an artificial intelligence (AI) that you can carry around in the pocket, where it waits patiently to be told what to do. In the week we spend together, my AI assistant has performed admirably in finding me restaurants, or the location of the nearest coffee shop.

    A typical command might be: “Reserve a table for two at a good French restaurant in San Francisco.” Siri responds by presenting a list of top-rated restaurants that can be booked on OpenTable.com. If you say which time you want, it can book you a table without your lifting a finger. In some ways Siri is just a fancy program to the 35 websites it can connect to, from taxi booking websites to movie review databases (数据库). But what's new is the way it can analyze the intentions of its users and use those sites to put them into action.

    Siri attaches possibilities to the explanation of each word and compare your location with other data, some of which you must provide yourself. To send email reminders, Siri obviously needs to know your email address. To “find me the flower shop closest to work”, it needs to know where you work. To pay bills or buy airline tickets, it would need to be linked to your credit card.

    That raises the question of how far we are willing to trust a piece of software that can go and do things for us based on what it “thinks” we mean. Siri may be simple, and always shows its explanation of a command before carrying it out. But it gives users a preview of a new balance between privacy, trust and convenience that the expansion of AI into everyday life is likely to develop.

    Most of us have gone away from “mad men” in the street, only to realize that they are in fact using a Bluetooth headset. Now a new University of Pennsylvania study shows that muttering can actually help people find lost objects—in other words, saying the name of an object helps you find it more quickly.

    Previous work has suggested that speaking aloud while performing step-by-step tasks, like tying shoelaces (鞋带), can help kids guide their behavior and let them focus on the job in hand. However, scientists were not sure if speaking aloud when performing tasks could help adults in the same way, especially when looking for particular objects. Professor Gary Lupan and Daniel Swingley, writing for the Quarterly Journal of Experimental Psychology, carried out some experiments. They hoped to give the fact that next time you lose your keys, muttering “keys, keys, keys” can in fact help you find them.

    Inspired by viewing people muttering to themselves as they try to find things like peanut butter in a supermarket, the researchers conducted two experiments to see if this actually worked. In the first, participants were shown 20 pictures of various objects and were asked to find a certain one, with some seeing a text label (标签) telling them what they were looking for. These participants were then asked to search for the object again while saying the word to themselves, with results showing that saying it aloud helped people find the object more quickly.

    The second experiment saw participants performing a shopping task, where they were shown photographs of items (物品) commonly found on supermarket shelves. They were asked to find all examples of a particular item, so if they were asked for apples they had to find all the bags of apples, as quickly as possible. The researchers found that there was also an advantage in saying the name of the product aloud when they were searching for something familiar.

    The University of Pennsylvania study shows that muttering can actually help people reach the target object—in other words, muttering to oneself helps to focus the mind on something. It works more effectively than seeing a written description. Repeating the word over and over again helps even more.

    Next time you raise an eyebrow at the views of your partner, friend, sibling (兄弟姐妹) or colleague, remember they could be helping to make you smarter.

    New research shows that intelligence is not fixed but can be boosted throughout adulthood by family members, bright mates and intellectually stretching (拉伸) careers.

    The study challenges the commonly held belief that intelligence is static by the age of about 18. Current scientific consensus suggests that intelligence is controlled by genes, with environmental factors such as schooling and nutrition playing a partial role up to this age. After this point, IQ scores stabilize (稳定).

    But James Flynn, professor of political studies and psychology at the University of Otago in New Zealand, argues that people can “upgrade” their own intelligence throughout their lives. He believes intellectual stimulation (刺激) from others is crucial as the “brain seems to be rather like a muscle – the more you use it, the stronger it gets”. However, the opposite is also true – so people sharing a home or workplace with those who are intellectually challenged risk seeing their IQ levels fall as a result.

    He found the “understanding quality” of a family changes the IQs of all members, especially children. It can “lift” or hold back, depending on the “gap between their brightness and that of their siblings and parents”. A bright ten-year-old with brothers and sisters of average intelligence will suffer a five to ten point IQ disadvantage, compared to a similar child with equally bright siblings. However, children with a low IQ could gain six to eight points by having brighter siblings and special educational treatment to help pull them up.

    Professor Flynn also concluded that although genetics and early life experiences determine about 80 percent of intelligence, the remaining 20 percent is linked to lifestyle. This means that people can raise their IQ, or allow it to fall, by ten points or more. Therefore, the best way to boost IQ level is to mix with bright friends, find an intellectually challenging job and marry someone cleverer.

    Recent summer temperatures in parts of Australia were high enough to melt asphalt. As global warming speeds up the heat and climatic events increase, many plants may be unable to cope. But at least one species of eucalyptus tree can resist extreme heat by continuing to “sweat” when other essential processes stop, a new study finds.

    As plants change sunlight into food, or photosynthesize (光合作用), they absorb carbon dioxide through pores on their leaves. These pores also release water via transpiration(蒸腾), which circulates nutrients through the plant and helps cool it by evaporation(蒸发). But exceptionally high temperatures are known to greatly reduce photosynthesis—and most existing plant models suggest this should also decrease transpiration, leaving trees in danger of fatally overheating. Because it is difficult for scientists to control and vary trees' conditions in their natural environment, little is known about how individual species handle this situation.

    Ecologist John Drake of the S.U.N.Y. College of Environmental Science and Forestry and his colleagues grew a dozen Parramatta red gum (Eucalyptus parramattensis) trees in large, climate-controlled plastic pods that separated the trees from the surrounding forest for a year in Richmond, Australia. Six of the trees were grown at surrounding air temperatures and six at temperatures three degrees Celsius higher. The researchers withheld (扣留) water from the surface soil of all 12 trees for a month to imitate a mild dry spell, then induced a four-day “extreme” heat wave: They raised the maximum temperatures in half of the pods（three with surrounding temperatures and three of the warmer ones）— to 44 degrees ℃.

    Photosynthesis ground to a near halt in the trees facing the artificial heat wave. But to the researchers' surprise, these trees continued to transpire at close-to-normal levels, effectively cooling themselves and their surroundings. The trees grown in warmer conditions coped just as well as the others, and photosynthesis rates bounced back to normal after the heat wave passed, Drake and his colleagues reported online in Global Change Biology.

    The researchers think the Parramatta red gums were able to effectively sweat — even without photosynthesis — because they are particularly good at tapping into water deep in the soil. But if a heat wave and a severe drought (干旱) were to hit at the same time and the groundwater was exhausted, the trees may not be so lucky, Drake says.

    Other scientists call the finding encouraging. “It's definitely good news,” says Trevor Keenan, an ecologist at Lawrence Berkeley National Laboratory, who was not part of the study. “It would be very interesting to know how this translates to other species,” he adds. Drake hopes to conduct similar experiments with trees common in North America.

    In films, dads change from cruel men to loving souls. Here is a list of good and bad movies dads.

    Atticus Finch in To kill a Mockingbird(知更鸟)

    GOOD DAD : A man whose wife has died with a young family and a busy job as a lawyer, Gregory Peck's character in the 1962 film is one of the great heroes of American cinema Firm but fair he teaches his children respect and human decency(正派). Harper Lee's novel gets a respectable transposition(转变)to film, thanks to Gregory Peck's perfect performance.

    Jack Torrance in The Shining

    BAD DAD: When Jack Torrance, his wife, Wendy, and son, Danny, escaped from the cold winter to the Overlook Hotel we know that Jack has hardly been a model father. But when Jack becomes extremely angry and tries to murder his family with an axe, Danny used his intelligence to defeat him and left him to freeze to death.

    George Bailey in It's a Wonderful Life

    GOOD DAD: James Stewart's character is a father-of-four who is saved from the edge of suicide (自杀)and realizes his positive effect on others' lives. Much of the film is unpleasant, with George shouting at his children as he faces financial problems. But finally the lovable father realizes the worth of his own life, the value of friendship and the importance of being a loving dad.

    Darth Vader in The Empire Strikes Back(帝国大厦)

    BAD DAD: When the unfriendly cyborg(半机器人)told Luke Skywalker that he was his father ,the son's reaction says it all: “No! No!” It's hardly a joyful welcome to the family. For most of his son's life, Darth Vader has been an absent dad—and he has just cut off Luke's hand. You can understand why Father's Day cards might not be available.

    Self­control is the ability to regulate and adjust responses in order to avoid undesirable behaviors, increase desirable ones, and achieve long­term goals. Common goals such as losing weight, exercising regularly, eating healthy food, giving up bad habits, and saving money are just a few worthwhile ambitions that people believe require self­control.

    One 2011 survey conducted by the American Psychological Association found that 27 percent of subjects identified a lack of willpower as the primary factor keeping them from reaching their goals. Researchers have found that people who have better self­control tend to be healthier and happier. In one experiment, students who exhibited greater self­control had better grades and higher test scores, and were more likely to be admitted to a competitive academic program. The study also found that when it came to academic success, self­control was a more important factor than IQ scores.

    The psychologist Walter Mischel conducted famous experiments in 1975 that were related to delayed gratification. In these experiments, children were offered a choice: they could choose to eat one treat right away, usually a cookie or a candy or they could wait for a brief period of time in order to get two treats. At this point, the researcher would leave the child alone in a room with a single treat. Not surprisingly, many of the kids chose to eat the single treat the moment the experimenters left the room. However, some of the kids were able to wait for the second treat.

    Based on his research, Mischel proposed what he  referred to as a "hot­and­cool" system to explain the ability to delay gratification. The hot system refers to the part of our willpower that is emotional and impulsive ( 冲动的) and urges us to act upon our desires. The cool system is the part of our willpower that is rational ( 理性的) and thoughtful, and enables us to consider the consequences of our actions in order to resist our impulses.

    Self­control is an important skill that allows us to regulate behavior in order to achieve our long­term goals. Research has shown that self­control is not only important for goal attainment, and people with greater willpower also tend to do better on all sides.