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In the United States, for example, nodding your head up and down means "yes". In some parts of Greece and Turkey, however, this motion can mean "no". In southeast Asia, nodding your head is a polite way of saying "I've heard you".

In ancient Rome, when the emperor wanted to spare someone's life, he would put his thumb up. Today in the United States, when someone puts his/her thumb up, it means "Everything is all right." However, in Sardinia and Greece, the gesture is insulting and should not be used there.

In the United States, raising your clasped (握紧的) hands above your head means "I'm the champion" or "I'm the winner". It is the sign prizefighters make when they win a fight. When a leading Russian statesman (政治家) made his gesture after a White House meeting, Americans misunderstood and thought he meant he was a winner. In Russia, however, it is a sign of friendship.

There are other nonverbal signals that people should be aware of when they go to another country, such as the distance to maintain between speakers. Americans stand closer to each other than English people. English people don't like touching somebody or being touched. Now in America, touch is important. Friends touch each other on the arm, for example. They often put an arm around a friend when they say "hello" or "goodbye".

"This was our target when we started, to grow enough flowers to feed a million bees on a single day." Mark said. "We are acutely aware that bees are under threat from modern farming methods and that East England is one of the worst places where bees are seriously suffering from lack of foraging (觅食) diversity," he continued.

"Every third bite of food you eat can come from bees and we wanted to create an operation on our farm that did not push nature out but rather hugged it — as a central part of our ecology system and our food cycle," he said.

The farm uses all kinds of seeds which can produce many different wild plants and of course, the bees can get food from different wildflowers.

"We are taking a very small role in helping society restore a balance and this starts with plant diversity to encourage insects, bees, small mammals (哺乳动物), and birds," said Paul. "At the end of the day, we see ourselves as caretakers of this land. Between us we have six children and we owe it to them to farm sustainability (持续性) and set an example for the generations to come," added Paul.

According to the Bee Conservation Trust, many types of bees have seen their populations decline by 70%, and two species have become extinct in the last century.

Gill Perkins, CEO of the Bee Conservation Trust said, "Thanks to Mark and Paul, at least here, 1 million bees can keep living — a beacon (灯塔) of hope demonstrating what's possible, which is of great significance for humans now and future."

Guilin and Lijiang River National Park

It impresses visitors with its foggy peaks and quiet, peaceful river scenes. You'll encounter pointed hills with sharp edges, as well as caves and cliffs across the park. Explore by boat for the best views of can't-miss sights like Elephant Trunk Hill, which looks like an elephant bending over the river to drink water with its trunk.

Arches National Park

You'll find a great number of natural arches in this eastern Utah national park. The most symbolic of these stone structures are Landscape Arch and Delicate Arch. However, visitors are equally amazed by Balanced Rock and The Windows Section, the latter of which is home to the largest arches in the park.

Rocky Mountain National Park

Including more than 265,000 acres of scenic mountain landscape, the park is home to more than 350 miles of hiking paths, 140-plus lakes and the 48-mile-long Trail Ridge Road, which reaches an altitude of over 12,000 feet. Adventurous visitors will want to choose must-see spots like Longs Peak for splendid views.

Banff National Park

Situated in southwestern Alberta, Canada's oldest national park is also one of its most beautiful. Visitors can explore Banff National Park on foot along more than 1,000 miles of hiking trails, or drive the scenic Icefields Parkway for breathtaking views of glaciers. For an unforgettable experience, go to the summit of mountain, where you will find a viewing boardwalk, a restaurant, and a theater.

One of the strange effects comes from the now famous "memory loss" study. Alan Preece and his colleagues at the University of Bristol placed a device thatmimicked the microwave emission of mobile phones to the left ear of volunteers. The volunteers were all good at recalling words and pictures they had been shown on a computer screen. Prece says he still can't comment on the effects of using a mobile phone for years on end. But he rules out the suggestion that mobile phones have an immediate effect on our cognitive (感知的) abilities. "I'm pretty sure there is no effect on short-term memory," he says.

Another expert, Lattersall, remarked that his latest findings have removed fears about memory loss. One result, for instance, suggests that nerve cell synapses (神经元突触) exposed to microwaves become more — rather than less — receptive to undergoing changes linked to the memory formation.

It would be an even happier outcome if microwave turned out to be good for you. It sounds crazy, but a couple of years ago a team led by William Adey at the Veterans Affairs Medical Center in California found that mice exposed to microwave for two hours a day were less likely to develop brain tumours (肿瘤) when given a cancer-causing chemical.

So should we forget about mobile phone radiation causing brain tumours and making us unable to think clearly or reasonably?

"If it doesn't certainly cause cancer in animals and cells, then it probably isn't going to cause cancer in humans," says William. And while there's still no absolute proof that mobile phone does damage your memories or give you cancer, the consensus is: Don't panic.