The best tool needed for survival in the event you get lost when you travel is your skill of advanced planning. You must expect the unexpected and plan accordingly. Even if you are going out for just a few hours, pack enough essentials that you can stay hydrated (体内水分), fueled and prepared for any type of weather. Your essentials should include at least:

    More than enough food and water for the activity you plan.

    A compass that you know how to use. You may want a GPS device, but those sometimes do not receive a signal or the battery fails. Cell phones also likely will not work because of a lack of signal.

    Appropriate maps. Study the terrain (地形) and your planned route. Know where you are going and how you will return.

    Comfortable hiking boots, clothes that you can wear depending on the weather conditions and additional socks in case the ones you arc wearing get wet.

    A blanket, flashlight, matches kept in a water-resistant container, and other items that will help you survive overnight if necessary.

    Cheek with the local forest office for special warnings, such as fires in the area, bear sightings, flooding, trail or road closures, etc.

It's also important that once you have planned your outing, tell someone. Give them exact details of where you are going, the trail you plan to follow, when you will return, the vehicle you are driving (and where you plan to park) and how many people will go with you—do not go alone.

    If you do become lost, your most important tool is keeping a positive mental attitude.

    Would it surprise you to learn that, like animals, trees communicate with each other and pass on their wealth to the next generation?

    UBC Professor Simard explains how trees are much more complex than most of us ever imagined. Although Charles Darwin thought that trees are competing for survival of the fittest, Simard shows just how wrong he was. In fact, the opposite is true: trees survive through their co-operation and support, passing around necessary nutrition（营养）“depending on who needs it”.

    Nitrogen（氮）and carbon are shared through miles of underground fungi（真菌）networks, making sure that all trees in the forest ecological system give and receive just the right amount to keep them all healthy. This hidden system works in a very similar way to the networks of neurons（神经元）in our brains, and when one tree is destroyed, it affects all.

    Simard talks about “mother trees”, usually the largest and oldest plants on which all other trees depend. She explains how dying trees pass on the wealth to the next generation, transporting important minerals to young trees so they may continue to grow. When humans cut down “mother trees” with no awareness of these highly complex “tree societies” or the networks on which they feed, we are reducing the chances of survival for the entire forest.

    “We didn't take any notice of it” Simard says sadly. “Dying trees move nutrition into the young trees before dying, but we never give them chance.” If we could put across the message to the forestry industry, we could make a huge difference towards our environmental protection efforts for the future.

    Like people, plants experience stress. And also, like people, the response to that stress can determine success.

    Bad environmental conditions, such as drought, flood, heat and other stresses, affect yields (产量) more than crop pests and diseases. We are trying to find a way to equip plants with the ability to tolerate environmental stress and maintain high yields, said Stephen Howell, a professor of genetics and cell biology.

    Plant cells produce proteins (蛋白质) and ship them to different parts of the cell. Under normal conditions, these proteins are folded into their normal, healthy structures as they are produced. When a plant is under stress, its cells produce poorly folded or unfolded proteins. Then a built-in system senses this and “sets off an alarm in the cell,” said Howell.

    In response to the alarm, another protein (IRE1) starts working and creates a different process which activates (激活) the stress response genes whose products bring about defensive measures that help the plant survive.

    “As it turns out, responses that are activated under stress conditions actually inhibit the growth of plants,” said Howell. “This allows them to preserve their energy to survive the stress conditions.”

    For plants in the wild, this response is a help for survival, he said. In production of agriculture crops, however, this response reduces yields.

    “You don't want crop plants to stop growing,” Howell said. “You want them to continue to grow and produce even though they are under stress.”

    With the new understanding of this stress response, the next step may be to silence the alarm system, said Howell. “What may be important is to disable some of these stress responses. That may make the plant more productive under stress conditions.”

    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."

    PARIS—A scaffolding(脚手架) firm that has worked on the roof of Notre Dame said some of its workers had smoked on the site, but ruled out that a cigarette butt(烟蒂) might have started the fire that destroyed the cathedral's oak－framed roof last week.

    A spokesman for family－owned Le Bras Freres, confirming a report in French weekly Le CanardEnchaine, told Reuters that some workers of its Europe Echafaudage scaffolding unit had informed police that they had "sometimes" smoked on the scaffolding, despite a smoking ban on the site.

    "We blame it. But the fire started inside the building...so for company Le Bras Frères this is not a hypothesis(假设), it was not a cigarette butt that set Notre Dame de Paris on fire, " Le Bras Frères spokesman Marc Eskenazi said. TheCanardEnchaine reported that police had found the remains of seven cigarette butts in the burnt－out cathedral."This is not wrong, " said a source close to the investigation, who declined all other comment. Eskenazi said it was impossible to set a log on fire with a cigarette butt and questioned how cigarette butts could have been found on the site."If cigarette butts have survived the fire, I do not know what material they were made of." he said.

    Europe Echaffaudage also ruled out the possibility that the fire might have been started by an electricity incident at one of the two lifts on the site."The lifts' electricity was perfectly within specifications and well maintained, " he said. He added that the two lifts were on the outside of the building, situated at 45 and 65 metres from the base of the spire(尖顶), where the first smoke and flames had been spotted and that the workers had cut the power to the lifts at 17:50 when they had left the site for the day.

    TheCanardEnchaine also reported that electrical wiring ran through the roof of the cathedral, but the church administration denied that safety norms had not been respected."Nothing was ever done without the approval of the state...There were no wires dangling, everything was properly installed," Notre Dame spokesman Andre Finot said.In 2012, electrical engines had been installed to sound the bells in the spire.

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