If you want to live longer and lower the risk of heart disease, a move to the mountains may help. Research by scientists in Greece shows that living in the mountains is good for the heart and longevity(长寿). People living at higher altitude(海拔) have lower possibility of dying from heart disease than those closer to sea level, even if they have factors that could increase their risk. "Residence in mountainous areas seems to have a 'protective effect' from heart disease," said Dr Nikos Baibas of the University of Athens. He and his colleagues suspect that the increased exercise from walking up mountainous area gives the heart a good workout and enables it to cope with lower levels of oxygen.

    Researchers studied the health records and death rates of 1,150 Greeks who lived in three villages near Athens over 15 years. One village was 1,000 meters above sea level and the other two were in low-lying areas. Although men and women living in the mountainous village had higher blood pressure rates and other risk factors than people in the other villages, they had a lower rate of death from heart disease and other causes after a fifteen year follow-up." The contrast was more evident among men than among women," Baibas added in a report in the Journal of Epidemiology and Community Health. Heart disease is one of the world's top killers. Smoking, high blood pressure, raised cholesterol levels, being overweight and a family history of the illness increase the possibility of developing the disease.

    Here is an astonishing and signficant fact:Mental work alone can't make us tired. It sounds absurd. But a few years ago, scientists tried to find out how long the human could labor without reaching a stage of fatigue(疲劳). To the amazement of these scientists, they discovered thett blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day labourer, we could find it full of fatigue toxins(毒素) and fatigue products. But if we took blood from the brain of Albert Einstein, it would show no fatigue toxing at the end of the day.

    So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours f efforts as at the beginning. The brain is totally tireless. So what makes us tired.

    Some scientists declare that most of our fatigue come from our mental and emotional(情感的) attitudes. One of England's most outstanding scientists. J. A. Hadfield,says,“The greater part of the fatigue from which we suffer is of mental origin. In fact,fatigue of purely physical origin is rare.” Dr. Brill, a famous American scientist, goes even further. He declares,“One hundred percent of the fatigue of a sitting worker in good health is due to emotional problems.”

What kinds of emotions make sitting workers tired?Joy?Satifaction?No!A feeling of being bored,anger,anxiety,tenseness,worry,a feeling of nt being appreciated—those are emotions that tire sitting workers.Hard work by itself seldom causes fatigue.We get tired because our emotions produce nervousness in the body.

    Anyone can try to lead a group, but not every individual is cut out for leadership. The better leaders possess a few qualities that can mean the difference between the success and failure of the group. These are the qualities the leader of higher rank will look for when choosing a leader for a group, or when evaluating the performance of a leader. They're also the qualities team members want in a group leader, and appreciate when they find them.

    Take Responsibility

    Group leaders might share tasks around a group as necessary, but eventually a group leader needs to be able to accept that responsibility lies on his shoulders. That means that if things go wrong in a group project, he's the one who must accept the consequences and work out what mistakes are made. The group leader won't always have the power to control everything group members do, but he should be ready to admit any mistakes the group has made as a result of his leadership

    Concern for Members

    The group leader has a commitment to the task or project at hand, but perhaps more importantly, he has a real concern for each and every person who is part of his group. This means getting to know the strengths, weaknesses and goals of team members, as well as making time to build the group through collective activities. The group leader should make sure that everyone is included, even if an individual is new to a group.

    Good Listener

    The group leader needs to be able to listen to the suggestions, complaints and ideas of group members. Not only will this allow complaints to be addressed and potentially suitable ideas to be put into practice, but a leader who listens will also encourage group members to share their concerns and thoughts, creating an atmosphere of free speech and productivity.

    Supermarket shoppers who buy lots of foods on "two for one" deals are far more likely to be obese (肥胖的), a major study suggests.

    Cancer Research UK found that those with highest consumption of discounted foods were at 50 percent greater risk of obesity, compared with those with low take-up of such deals.

    The study of more than 16,000 households found almost one in three food and drink items in UK supermarket baskets were bought on promotion. And the discounts were far more likely to be applied to unhealthy foods, with almost half of all chocolate, crisps, popcorn, and savoury snacks bought on promotion.

    Shoppers whose baskets contained between 40 and 80 percent of goods on special offer were 54 percent more likely to be obese than those with a maximum 20 percent of foods on such deals. Those with highest take-up of the deals bought 30 percent less fruit, and nearly 25 percent fewer vegetables than those shunning the deals.

    The study follows a government consultation on proposals to ban "buy one, get one free" deals on unhealthy foods and supermarket "guilt lanes" as part of its childhood obesity strategy.

    One in five children are overweight or obese when they start primary school, rising to around one in three when they leave.

    Research has found that obesity increases the risk of 13 different types of cancer including bowel and breast disease.

    Alison Cox, director of cancer prevention at Cancer Research UK, said: "The government's proposed 9 p. m. ban on junk food ads is a step forward in fighting childhood obesity. Now we want to see restrictions on price promotions for unhealthy food and drink items, as well as those strategically placed at checkouts. This will help families to make healthier choices.

    "There isn't one magic fix for the problem, but getting rid of these encouragements to buy unhealthy food is key to changing it."

According to a study published this week, habitual napping (打盹) appears to be associated with a large brain volume in adults although experts stressed that further research was needed. It reduces the cost caused from the lost time and the fatigue-related errors. The work followed previous studies that suggested a brief doze could improve people's ability to learn.

Arianna Huffington, a co-founder of Huff Post and the founder and chief executive of Thrive Global, said, "Given the latest science on the effectiveness of napping and the clear link between employees feeling well rested and their productivity, it's long past time that businesses embrace short naps at work."

Some businesses, including Thrive Global, have already introduced facilities for employees to take naps. Google introduced sleep pods as far back as 2014 and companies like Nike and Ben & Jerry's introduced nap rooms. The practice has even been adopted by the NHS, with a growing number of hospitals introducing sleep pods for staff in an effort to help them get more rest. Employees, it seems, are enthusiastic. Sean Greenwood, of Ben & Jerry's, said, "If a quick nap gets employees more involved and creative, we're happy to provide that for our team members."

Unfortunately, the practice of napping still suffers from our collective concept that sleep equals weakness and laziness. However, the performance-enhancing benefits of naps have been no secret to many leaders throughout history. It also gives the higher-ups the chance to acknowledge the 24/7 culture and come up with top-down solutions that encourage workers to take care of themselves in and out of work.

While sleep experts stressed that a daytime doze could be beneficial, they said it was crucial to get enough shut-eye at the end of a day. It is the late stage of sleep, sometimes missed by early risers, that strengthens the nerve circuits that make for learning and memory, allowing the brain to make and consolidate new neutral connections. Additionally, prioritizing sufficient sleep during the regular nightly sleep period is essential for overall well-being.

Much of Earth is unexplored. An ocean census (普查) hopes to change that.

"Earth" has always been an odd choice of name for the third planet from the Sun. After all, two-thirds of its surface is covered not by earth at all, but by oceans of water.

Because humans are land animals, most of the Earth remains under-explored. Marine (海洋的) biologists think the oceans might host more than 2 million species of marine animals, of which they have so far identified perhaps a tenth.

A new initiative hopes to change this. Launched in London on April 27th, Ocean Census aims to discover 100, 000 new species of marine animal over the coming decade. It is backed by Nekton, a British marine-research institute, and the Nippon foundation, Japan's biggest charitable foundation. Its first ship, the Norwegian icebreaker Kronprins Haakon, set sail on April 29th, bound for the Barents Sea.

The initiative is happening for two reasons. One is that the longer scientists wait, the less there will be to identify. Climate change is heating the oceans, as well as making them more acidic (酸的) as carbon dioxide dissolves goes into the water. Already around half the world's coral reefs (珊瑚)—thought to be home to around 25% of all ocean species—have been lost. Oliver Steeds, Nekton's founder, says that one of Ocean Census's priorities will be identifying species thought to be in the greatest danger from climate change. The second reason is technological. Marine biologist s find about 2, 000 new species a year, a rate hardly changed since Darwin's day. Ocean Census is betting it can go faster.

Exactly what the new effort might turn up is impossible to predict. But history suggests it will be fruitful. Half a century ago scientists discovered hot vents (喷口) on the sea bed. These days, such vents are one possible candidate for the origin of all life on Earth. There are more practical benefits, too. Many drugs, for example, come originally from biological substance. An ocean full of unidentified life will almost certainly prove a rich mine from which to mine more.