Reader's Travel Photography Competition

    This month's images include some original and brilliant shots. The overall 2018 winner will receive a $200 holiday ticket and go on a 16-night wildlife holiday.

Why Mars (火星) is New Settlement

    Is it possible to live on other planets? The United States government is taking a serious look at the moon and Mars as potential places for future human settlement. The moon could serve as a training ground for later journeys to Mars. Currently, with Mars becoming the eventual long-term goal, serious questions exist as to whether the dangers of the settlement on the moon are too extreme and unnecessary.

    One major reason the settlement on the moon is too dangerous is the difference between the atmosphere environment of the moon and Mars. Atmosphere is important because it protects humans and all other life from a continuous attack of radiation (辐射) caused by sources such as the sun. This radiation is especially dangerous to humans because it increases the risk of cancer and can negatively change DNA. The fact that the moon has no atmosphere can cause great harm to human beings. Although Mars' atmosphere is significantly thinner than Earth's, at least it has one and would create some sort of protective barrier for humans.

    Another important characteristic necessary for human settlement is natural resources like water, of which the moon is believed to have none. Mars, however, contains vast quantities of water ice, dry ice, and also snow. There is also sufficient evidence that water once existed at the surface of Mars and might return in the future if the planet warms. With increased technologies, the potential for settlers to remain on Mars by being increasingly self-sufficient makes Mars a much more attractive goal as the space settlement than the moon.

    Future settlers will not only benefit from potential water on Mars; the planet is also rich in other natural resources such as oxygen, hydrogen, and minerals, which can be well used in productive ways.  For example, hydrogen can be used as fuel, and it can be combined with nitrogen (氮气) to form new materials necessary for human settlement. Due to these advantages,

    Mars would be a more successful planet for exploration and settlement because it contains the basic resources necessary for humans to survive.

    Since the environment of Mars is more similar to that of Earth and it contains resources necessary to  help  life  exist,  it should  be  the  only option for any kind of long-term human settlement. The settlement on Mars would not only be a milestone in space but also an excellent chance for mankind to improve itself from past adventures on Earth and preserve and make the best use of the natural resources Mars has to offer.

    It's Friday night. You're looking through your Instagram (a photo-sharing app) feed when you see it: a photo of your friends hanging out without you.

    Why didn't anyone invite you? What are they doing later? Should you text them? What if no one responds (回应)?

    Sounds like a typical case of FOMO.

    FOMO, or "fear of missing out", is a form of anxiety that causes people to feel like they're missing out on something. The word was added to The Oxford English Dictionary last year. But just how serious is FOMO?

    According to a study by a US research organization, JWTIntelligence, 47 percent of teen millennials (those who are 13-17 years old now) feel upset or nervous when they learn that their friends are doing something they're not. And 41 percent said they spread themselves too thin, trying to do too many things at one time to avoid FOMO.

    Today's technology is a big cause of FOMO, according to Jonathan Pochyly, an adolescent psychiatrist (青少年精神病学专家) at Lurie Children's Hospital in Chicago.

    "Technology is one of the things that makes life special for adolescents these days," he explained.  

    "There's a lot of focus on what everyone else is doing. It became a trend, so there's pressure to keep up with it."

    As social media (社交媒体) feeds are always updating us with our friends' activities, it's easier than ever to feel left out. So what can we do?

    To fight against FOMO, Jones freshman Emmy Brewer just calls people and talks to them.

    "I'd be upset for a bit, but then I'd realize that I should be reaching out to them," she said.

    Oak Park and River Forest High School senior James Cullinane said he fights off FOMO by living in the now.

    "If I'm hanging out with my friends, or just sitting at home on my couch, I think it's best to stay off social media and focus on what I'm doing in the moment," Cullinane said.

    While FOMO will continue to affect (影响) teenagers in the future, Pochyly said that he believes these feelings are just side effects of growing up.

    "These types of interactions (交往) with people are … a function (功能) of kids being more independent, looking for connections with other people, moving away from just being a child in a home, and moving toward adulthood," he said.

    British scientists have discovered the willow trees planted at an angle could increase sugars for biofuel production.

    Willow is a fast-growing species. It is already used to produce fuels for the renewable heating and power market. In future it could also help to produce biofuel to power vehicles. It has been known that when willows growing in the wild are blown sideways, they tend to produce more sugars. But for a while it has not been known why this happens.

    Researchers at Imperial College London, led by Dr Nicholas Brereton and Dr Michael Ray of the Department of Life Sciences, have now solved the mystery. When the tree is blown sideways, its genes (基因) produce large numbers of sugar molecules (分子) to straighten the tree upwards.

    “This is an important breakthrough. Our study now shows that natural genetic changes are related to these differences. And this could well be the key to unlocking the future for green energy from willow,” said Dr Brereton.

    The research was carried out under lab conditions. The willows were grown at an angle of 45 degrees. They were compared to willows which grow naturally straight upwards. The team then looked for the same effect among the willows growing on the Isle of Orkney where strong winds cause the trees to bend at extreme angles. They discovered that the Orkney trees produce five times the amount of sugars found in willows grown in sheltered conditions.

    Willow is widely planted across the UK. The results show that biofuel crops such as willows could be grown in climatically changeable conditions where chances of growing food crops are limited.

    The study is published in Biotechnology for Biofuels.

    About three decades ago, China was known as the "Bicycle Kingdom".But the two­wheeled transport's popularity began to fade, with many bikes soon replaced by their fuel­powered competitors.

    But recent months have seen a renaissance of the bike across China, with an increasing number of people choosing cycling instead of driving to schools, to workplaces or to do sightseeing. The introduction of bike­sharing schemes, first developed by new companies like Ofo and Mobike, has brought the trend to a new level. According to data from iResearch Consulting Group, the first week of this year saw 5.85 million active users of Mobike while Ofo had 1.4 million active users.

    People can unlock the shared bikes by simply using their smartphones. The bikes are equipped with GPS and can be left anywhere in public places for the next user. They're popular among many Chinese people as they provide an effective answer to the "last mile" problem, which refers to a person's final journey. "In places where the subway doesn't reach and where it's difficult to change from one kind of transport to another, it's so easy to get where you want to go with Mobike," Hu Hong, 29, said. She rides a bike to work.

    However, the schemes have also led to problems such as illegal parking, vandalism (故意破坏) and theft. "Bike­sharing is a greener method of transportation and provides a user­friendly experience," said Liu Xiaoming, Vice­Minister of Transport. "But it's a combination of online and offline business. Operators are usually strong in online services, but lack offline business experience."

    In fact, these problems are also shared by bike­sharing schemes abroad. Set up in 2007, Vélib is a large­scale public bike sharing system in Paris. By October, 2009, a large number of Vélib's initial bikes had to be replaced due to vandalism or theft. Bikes were found hanging from lampposts (街灯柱) or thrown into the Seine River.

A 293-million-mile journey of the NASA Perseverance rover (探测器) to Mars: ended successfully on February 18, 2021, with a picture-perfect landing inside the Jezero Crater. The car-sized, six-wheeled rover, nicknamed Percy is the US space agency's biggest and most advanced explorer to date. Its primary mission is to search for signs of ancient microbial (微生物的) life on Mars.

Landing on Mars is extremely tricky. The Red Planet's gravitational pull causes approaching spacecraft to go faster to high speeds, while its thin atmosphere-just 1 percent that of Earth's-does little to help slow it down as it approaches the surface.

The scientists had to reduce Percy's 12,000 mph speed to a safe landing speed of less than five mph-in just six and a half minutes. The target entry angle also had to be a precise 12 degrees-any steeper, and the spacecraft would burn up; any flatter, and it would get lost in space. It is no wonder that the final approach is often referred to as the "seven minutes of terror. "

Upon attaining a manageable speed, Percy briefly flew over the Martian surface to seek out the perfect landing spot. Its complex map-reading system rapidly scanned the area and matched it with maps in its database to find the best location.

The NASA scientists will spend the next two months testing Percy's scientific instruments. Once ready, the rover will begin to carry out its mission.

"Perseverance is the smartest robot ever made, but confirming that microbial life once existed carries an unusually large burden of proof," said Lori Glaze, director of NASA's Planetary Science Division. "While we'll learn a lot with the great instruments we have aboard the rover, it may very well require the far more well-equipped laboratories and delicate instruments back here on Earth to tell us whether our samples (样本) carry evidence that Mars once harbored life. "