【推荐1】If you ask most people what water tastes like, they’ll probably tell you that water has no taste and they may give you a funny look. But if you were a fruit fly, asking another fruit fly, that question might have a different answer.

To a fruit fly, water has a taste. Scientists want to know how the fruit fly knows water because this information may help in learning how other animals — or even individual cells — manage to use water in the right way. Water is important to life, but too much or too little can be deadly to a living creature. So by understanding how the fruit fly tastes water, researchers may learn more about other living things.

According to the new study, a protein(蛋白质)called PPK28 makes it possible for a fly to taste water. Proteins build cells and tissues, fight disease and carry messages between cells. It’s not surprising that a protein is responsible for the fruit fly’s ability to taste water.

The PPK28 protein is part of a larger family of similar proteins. One of these related proteins is used by mammals(哺乳动物)(including humans)to taste salt. Scientists have not found a protein that enables humans to “taste” water.

In the experiment, Cameron and his team compared normal fruit flies with fruit flies whose taste cells had been disabled. The fruit flies were given a special chemical that would glow(发光) when the fly used the PPK28 protein. Then the scientists led the flies to water. When the normal flies tasted the water, the PPK28 protein lit up — showing that it was in use.

The fruit fly in particular is so interesting that some scientists are hard at work creating a complete map of the fruit fly brain. This map will show all of a fly’s neurons and help scientists understand how the neurons(神经元)work together.

【推荐2】There are various ways in which to read body language so that you can understand how someone is feeling. Reading emotional clues （线索）is one of them.

Crying is considered to be caused by an explosion of emotion in most cultures. Often times crying is considered a sign of sadness, but crying can also be an expression of happiness. Crying can also come about through laughter and humor. Thus, when judging crying, you'll need to look for other signs to determine the meaning of the crying. Crying can also be forced in order to gain sympathy or to cheat others. This practice is known as " crocodile tears" , an expression that draws on the wrong idea that crocodiles" cry" when catching prey（猎物）.

Signs of threat include v-shaped eye brows, wide eyes, and an open or down-turned mouth. In a similar way, arm tightly crossed over the other is a common sign that the person is angry and is closing himself off to you.

When people show anxiety, they display increased facial movements, and their mouth made into a thin line. Individuals who are anxious may also play with their hands, unable keep them in one spot. Anxiety can also or have nervous legs. It can be conveyed when people seemingly unconsciously（无意识 地）tap their feet or have nervous legs.

Embarrassment can be expressed by turning the eyes or shifting them away. If someone looks down at the floor a lot, they are probably shy, afraid, or embarrassed. People also tend to look down when they are upset, or trying to hide something emotional. People are often thinking and feeling unpleasant emotions when they are in the process of staring at the ground.

There are also some signs of pride. People show pride by displaying a small smile, holding their head backward, and putting their hands on their hips.

【推荐1】It doesn’t matter when and how much a person sleeps, but everyone needs some rest to stay alive. That’s what all doctors thought, until they heard about Herpin. Herpin, it was said, never slept. Could this be true? The doctors decided to see this strange man themselves.

Herpin was 90 years old when the doctors came to his home in New Jersey. They thought for sure that he got some sleep of some kind. So they stayed with him and watched every movement he made. But they were surprised. Though they watched him hour after hour and day after day, they never saw him sleeping. In fact, he did not even own a bed. He never needed one.

The only rest that Herpin sometimes got was sitting in a comfortable chair and reading newspapers. The doctors were puzzled by this strange continuous sleeplessness. They asked him many questions, hoping to find an answer. They found only one answer that might explain his condition. Herpin remembered some talk about his mother having been injured several days before he was born. But that was all. Was this the real reason? No one could be sure. Herpin died at the age of 94.

【推荐3】Some Famous Libraries in the World

The Royal Library of Alexandria in Alexandria, Egypt is probably known as the largest and the most famous library in the ancient world. It is said that the ancient library was burned three times over the centuries. A likeness of the ancient library was built in Alexandria and was opened on October 16，2002.

Celsus Library was built in what had been a monument tomb of the governor of the Province of Asia, Celsus Polemaeanus in Ephesus, Turkey. It used to be the third richest of ancient times in the world，which had more than 12,000 works of art, but it was destroyed in wars, leaving some ruins. Even so, it is now still so world-famous for its beautiful structure that many visitors come to see it. There is a statue of Athena at its entrance as she is the Goddess of Wisdom. It remains delicate and appealing.

Bodleian Library is attached to Oxford University and mainly used as a research library. It is also a copyright library, which means it has a right to every book published in the United Kingdom. The library was designed by the architect, Sir Giles Gilbert Scott. Construction was completed in 1940.

The British Library was set up in 1973 and is one of the world’s greatest libraries. This library has PACCAR gallery of living and workshop of words. The sounds and images offer shows and different programs at the theme exhibitions. They also have a wide collection of stamps of the world which are on show for visitors. The library also offers events like music and discussions.