Research finds out why some people are constantly under attack from the bloodsucking insects while others walk free.

    For those unfortunate enough to feature highly on the mosquito hit list, summer nights can be synonymous with mosquito bites. Yet others hardly ever get bitten. So how do the bloodthirsty insects select their victims?

    The insects' tastes may seem arbitrary. However, research shows that when mosquitoes make their choices between potential victims, it all comes down to scent (气味).

    “Mosquitoes are attracted by carbon dioxide and heat, which everyone gives off. But mosquitoes are also attracted by certain scents,” says Karl-Martin Vagn Jensen, the head of research at the Department of Agricultural Science at Arhus University.

    According to Jensen, it has not yet been confirmed exactly what the scents in question are. But research does indicate that some scents are more attractive to mosquitoes than others.

    “All the lab employees rubbed petri dishes (培养皿) against their stomachs. In that way, their scents were put on the dishes, which were then put in a container full of mosquitoes,” he says. “The mosquitoes repeatedly landed on some of the petri dishes, but didn't go anywhere near the others.”

    Perhaps taking inspiration from popular fiction, there are also those who consider garlic as an excellent repellent (驱虫剂) against the winged bloodsuckers. According to the researcher, this strategy may not be entirely fruitless. “As far as I know, there is no scientific proof that eating garlic works. But there may be something to the theory that it's possible to mask scent with garlic,” he says. The only reliable method of protection against mosquitoes is to use repellents that are sold over the counter. It contains some smells that can confuse the mosquitoes. When the mosquito comes closer, it uses smell, heat and carbon dioxide to decide whether to bite. But if it is confused by a repellent, it will never get that far.

    Despite what so many people would love to believe, NASA hasn't discovered any evidence of past or present intelligent life on Mars. So, when the Curiosity rover (好奇号探测器）found something suspicious on the Red Planet's surface, they were not only surprised but also a little bit worried.

    The thin fragment (碎片）was suspicious enough to guarantee its own name, with NASA's Curiosity rover team calling it the “Pettegrove Point Foreign Object Debris,” named for the location where it was discovered. With no idea what it was or where it came from, the rover s handlers began to worry that it might actually be a piece of the rover itself, suggesting some unseen damage or other issue with the robot. Thankfully, those concerns seem to have been unfounded.

    In a new update from NASA the object has now been identified as a natural piece of rock rather than a piece of any man-made craft or vehicle. The team analyzed the bizarre object with a tool called the ChemCam RMI. The instrument uses a laser (激光器）t0 sniff out the makeup of anything it's pointed at, and the results for this particular piece of debris revealed that it's actually just a very thin piece of rock.

    NASA describes the inspection： The planning day began with an interesting result from the previous plan's ChemCam RMI analysis of a target that was referred to as “Pette Point Foreign Object Debris” （PPFOD),and speculated to be a piece of spacecraft debris fact was found to be a very thin flake of rock, so we can all rest easy tonight-Curi0sity n0t begun to shed its skin!

    How this particularly thin sliver of rock got to where it is—and why it seems to be a different colour than the surrounding sand and debris-remains unexplained, but at least the rover falling apart.

    Stephen Hawking was born in Oxford, England on 8th January, 1942. He went to school in St Allbans, a small city near London. Although he did well, he was never top of his class.

    After leaving school. Hawking went first to Oxford University where he studied physics and then went to Cambridge University where he studied cosmology(宇宙学）. As he himself admits, he didn't work hard. He was a very lazy student, and did very little work. However, he still got high marks.

    It was at the age of 20 that Hawking first noticed something was wrong with him. He started to bump into things. When he visited his family at Christmas time, his mother was so worried that she made him see a doctor. Hawking was sent to hospital for tests. Finally, the result came back. Hawking had motor neuron disease (运动神经元病）, an incurable illness which would make him unable to speak, breathe or move without the help of a machine. Doctors said they had no way to help him. He would die before 23.

    At first, Hawking became very depressed. After a while, though, he began to see his life in a different way. As he later wrote, "Before my illness was diagnosed(诊断), I had been very bored with life. There had not seemed to be anything worth doing. But shortly after I came out of hospital, I suddenly realised that there were a lot of worthwhile (值得做的）things I could do." Then Hawking got married and found a job at Cambridge University as a professor, He strongly believes that his story shows that nobody, how bad their situation is, should lose hope. "Life is not fair." He once said. "You just have to do the best you can in your own situation."

    At times we all get angry when we are driving. It might be because we are stuck in a traffic jam or stuck behind a very slow driver. It might be because we think another driver has done something very stupid and dangerous. Whatever the reason, it seems that getting angry in a car is something which happens more and more often and there is now a special term for it: "road rage". Some experts even think that road rage is a kind of mental illness! How can we recognize this "illness" of road rage?

There are two kinds of road rage: aggressive driving and aggressive reactions to the way other people are driving. Aggressive driving can take different forms:

    Driving much faster than the speed limit.

    Increasing your speed very quickly.

    Driving very close behind the car in front and sounding the horn or flashing the headlights.

    Changing lanes very suddenly and blocking another car.

    Moving into a parking space where another ear is trying to park.

There are also different reactions to the way other people are driving. These include:

    Making rude signs at people.

    Shouting at people and threatening them.

    Deliberately driving into another person's car.

    Hitting somebody.

    Using a weapon such as a baseball bat, or even a gun or a knife.

    Road rage is certainly not a joke. There have been incidents of road rage which have led to serious injuries and even murder. Experts think that one reason for road rage is that films show a lot of examples of fast and aggressive driving such as car chases where this kind of driving seems to be positive.

    Experts also think that the punishments for dangerous driving are not serious enough. Experience shows that driving problems can be controlled，but it takes a long time. In the UK in the last 30 years, he police have been quite successful in reducing the number of people who drink and drive. They are now working to stop people using mobile phones when they are driving. Let's hope they can have the same success with road rage.

After moving to the United States in 1901, 19-year-old Bob Douglas found a job as a doorman in New York. Later, a co-worker took him to visit a basketball court, and he was amazed by the athletic prowess on display. At that moment, Douglas, who had enjoyed playing sports as a child, was determined to create a basketball team and provide greater opportunities for New York City's Black athletes. 

He needed to find a place for his team to play. When asking a ballroom owner, William Roach, for permission to use one of the dance floors, Douglas was replied with "you guys will break up my place". After promising to take on all the financial risk, he finally persuaded Roach to change his mind and called the team "Rens". 

However, their ballroom had fewer seats and attracted fewer people than others, so Douglas had to pack the house to generate profits and keep his team alive. They traveled the country playing any opponent that would agree to schedule them, during which they repeatedly faced discrimination and unfair treatment and the players were often banned from hotels and restaurants. 

No matter the obstacle, the Rens just kept strict practicing. They helped change the game of basketball by focusing on quick passing, which let the players move faster, play a more fluid (流畅) game and keep winning. In 1925, the Rens shocked the world by defeating the Original Celtics, the most dominant team of their day. During the 1932-33 season, the team won 88 straight games, a professional basketball record that remains unbroken. 

Unfortunately, the Rens disbanded (解散) in 1949. But in time, they were recognized for the important role they played in advancing Black athletes in basketball, ensuring that although the Rens aren't a household name, their story will never be forgotten.