【推荐3】What You Need to Know Before You Go to Alaska

Note: If your journey includes travel in Alaska’s high altitude(海拔)regions, you may experience altitude sickness. Please consult your health care provider for suggestions on prevention and treatment.

Because of its vast size, a wide variation of climates is found across Alaska. In the interior(内陆)temperatures can exceed 90°F during summer, while the southeast and south-central coastal regions will average 55°F to 70°F. While daytime temperatures can be quite warm nights can be very cool. Use a website such as weather: com to find out the average temperatures and rainfall during your travel time

During your tour you will be exposed to the weather. As Abercrombie and Kent (A&K)programs to Alaska operate in summer, exposure to the sun is the most common concern, but cold days are also possible at any time of year. Pay special attention to the clothing suggestions and check the weather before your trip.

National parks and their surrounding areas are often home to a few troublesome plants and insects Poison oak(毒葛 )is one such plant o look out for. Your guides will help you identify t if you’re not sure what to Took for. If you come into contact with it, it is very important to wash with soap and water as quickly as possible. Keep in mind that the irritating oils from the plant are easily transferred from you, your clothing or equipment to other people or equipment, so even if you're not sensitive it is important to consider others.

The mosquito population in summer is quite high. The mosquitoes are large and aggressive. Be certain to pack insect repellent(驱虫剂 ) Those who are more sensitive to mosquitoes may also consider bringing head netting

【推荐1】Travelling to China is like travelling to another world. Its many famous beautiful places will make you lose yourself in them. However, it is usually not enough for a traveller only to visit these nice places. If you have time to see the local people, talk with them and even have dinner with a local family, it would be a wonderful experience, to know more about the local people’s life style at home in China.

New Hope Travel Agency will arrange a family visit to Xi’an, an ancient historic city inChina. We especially have chosen typical local families to host this activity in which you can see the true living style of Chinese people. Most of the hosts retired at home, so they are happy to see visitors from different countries to come to their homes.

Not only can we arrange to visit the local family but we can arrange to taste the true home cooked dishes. Our tour guide will ask you for advice about the food you want to eat. Just enjoy the locally cooked dishes. It’ll be quite a different and exciting experience.

Our agency also provides a good opportunity for you to learn to cook Chinese food. We have a general cooking class in the local family. If you’d like to learn to cook one or two Chinese dishes, please go to our Chinese Food Cooking Class to choose your favorite dishes.

Don’t wait. Welcome to China.

【推荐3】US cosmologist (宇宙学家) Carl Sagan once said: “Across the sea of space, the stars are other suns.”

For centuries, human beings have dreamed of traveling into space, orbiting (围绕......运行) our little blue planet, and appreciating incredible views of sunrises and sunsets. And soon, it seems that our dream will finally come true, as US startup Orion Span announced on April 6 that it planned to launch the first hotel in space in 2021. It will be ready to welcome guests the following year.

The space hotel, Aurora Station, will orbit 320 kilometers above Earth, circling it every 90 minutes. It’s capable of housing two crew members and four guests. The crew members will likely be former NASA astronauts who worked on the International Space Station. However, there’s a catch: Each guest must pay at least $9.5 million (60 million yuan) for a 12-day stay at the hotel.

Once aboard the Aurora Station, guests will find many exciting things to do. According to Orion Span, guests can enjoy the excitement of zero-gravity as they fly throughout the space hotel. They can watch 16 sunrises and sunsets every day and view the northern and southern auroras (极光) through the many windows. They can take part in research experiments like growing food, and even take it home as a souvenir. And they can stay in touch with their families and friends via a high-speed internet connection.

But most importantly, the trip will offer a real sense of what it’s like to live in space. “The premise (前提) of Aurora Station is for guests to live, feel, and [breathe] what it’s like to be an astronaut,” Frank Bunger, founder of Orion Span, told the Robb Report. “The food and drinks are freeze-dried products. It’s not going to be five-star dining … Fire and gas don’t work the same way in space as they do on Earth.”

To better prepare guests for space travel, the company will require a health screening and provide a three-month training program that helps guests understand basic spaceflight, orbital mechanics (轨道力学) and life in the pressurized environment of space.

Some may have doubts about the project, but the company even has plans to turn part of Aurora Station into private apartments. “Future Aurora owners can live in, visit, or sublease (转租) their space [apartment],” Bunger said in a news release. “This is an exciting frontier (待开发的领域) and Orion Span is proud to pave the way.”

【推荐3】Should swimming lessons be compulsory in schools?

Guangdong Province is set to make swimming lessons compulsory in primary schools starting from 2020,proposing the courses should be given from the fourth grade.Do we need to make swimming compulsory in schools?Forum(论坛) readers share their opinions.

White Bear(Poland)

In Poland swimming lessons are not compulsory,but most of the schools have them.I think that when it is only possible,there should be the swimming lessons for kids.It is a life-saving skill.

Mister Panda(France)

I come from France where swimming lessons in school are compulsory(dating back to Charlemagne).I even got my life-saving certificate in school.

Boilermaker(Expert in China)

There are swimming lessons in my city,but I was very disappointed in how they were taught.The kids spent 45 minutes of the one-hour lesson practicing strokes on dryland.They only spent 15 minutes in the water.All of the children panicked and sank immediately to the bottom.Then all of the parents scolded the children,telling them they weren’t paying attention to the teacher and that they were failures.

Yunzhang(China)

It is a pity that many Chinese athletes have won world championships in swimming while most schools don’t have the swimming facilities.Swimming is an essential life-saving skill that everyone should have access to.The earlier,the better.The government needs to put money into the popularity of the sport.

【推荐1】When we sleep, our brains clear out the memories we've made while we're awake, deciding what to keep and what to discard. Forgetting is an active process, explained the authors of a study published in the journal Science. But less is known about this process during the different stages of sleep.

The team found that during the rapid eye movement （REM） sleep stage, when active sleep happens and we are thought to dream, special nerve（神经）cells appear to actively lead to forgetting. What are known as MCH neurons（神经元）sit in the hypothalamus ——a part of the brain which helps with a range of functions such as sleep, appetite and emotions. Past research has suggested these cells help to control REM sleep patterns.

The team looked at MCH neurons in mice, and found 52.8 percent were active during REM sleep, compared with 35 percent when the mice were awake. They also turned MCH neurons on and off during memory tests. MCH cells appeared to send messages to the part of the brain to stop the formation of memories.

Study co-author Thomas Kilduff said the team was surprised to find that mice performed better on learning and memory tasks when the MCH cells were inhibited（受抑制）.“This result suggests that stimulation of the MCH neurons may disturb memory strengthening - that is, MCH neurons may help forgetting," Kilduff explained.

Asked what motivated the study, Kilduff said, "There is research argument about the role of sleep-in learning and memory, specifically, whether REM sleep, slow-wave sleep or both types of sleep are important for memory strengthening."

Kilduff acknowledged the study was conducted only on mice, not on humans. Also, mice are animals that remain active at night, with periods of sleeping and being awake distributed throughout the day and night, whereas most humans have a single sleep period that usually occurs at night, he said.

【推荐2】Hello! Wait! Don't run away. Yes, I know I am a roach. So, what's wrong with that?

You are speaking to the most successful species on the planet, you know! We've been around for 350 million years!

So what's the secret of our success? Sure, we've had plenty ofenemies. If you're small and full of protein, everything wants to eat you. So what did we do? We got quick, is what. We learned to hide, is what. We can squeeze so flat that we can fit through gap no bigger than a coin. Really! I dare you, try it.

And we never skip a meal! What do we eat? What have you got? Rotting leaves, garbage glue, paper, leather...and if you like to eat dead things, I tell you, the world is your refrigerator! But just don't offer me a cucumber or plastics!

Once humans came along, we went everywhere humans went. In ships, on planes, in camepacks across the desert Roach road trin! We even followed them to space! That's Uncle Anton. He hid on board the A pollo capsule — he was so mad when they just came right back to earth.

You can't have too many roaches. I say. Now there are 4.000 species of us: Asian, American. German... hope you get to meet them all someday.

Some of the family get pretty strange That's Reginald. He thinks if he pretends to be a firefly, birds won't oat him. That's tough old Ant Elo. She worked for some scientists trying to figure out ways to get rid of us ...ha! Poison, radiation, heat, cold…whatever they throw at us, we just get tougher. Bring it on!

Aw, look. that's me just after my 15 brothers and sisters and I hatched （孵化) out from egg case. Yeah. I look pretty much the same. That's another roach wonder — we skip the larva stage(幼虫期).Our eggs hatch all ready to roll! Still pretty cute, though.

Yep, that's how we got to be the most successful species on the planet!