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Snow leopards (豹) are so hard to photograph that scientists aren't even sure how many of these endangered animals still live in the wild.

The Snow Leopard Conservancy(SLC) set up 20 cameras in Russia in 2010 to learn more about the big cat. After a full six months, they had exactly zero picture! That's when the organization understood they needed help. And the only people who could help them in finding the leopards were the very people from whom they wanted to protect the animals—local hunters.

Hunting snow leopards is against the law in Russia, but in the terrible climate of Siberia, the few people living there had to turn to poaching (偷猎) to feed their families.

In 2013, Russian naturalist Sergei Spitsyn approached Mergen Markov, a local hunter, and told him his project. Markov agreed to set up the camera where he knew he would find leopards, and it worked. 

Markov, once a poacher, works full time for the conservationists now and has 10 cameras monitoring leopards. "I visit each camera once a month. I have known this whole region since I was a child," he said proudly.

The World Wide Fund For Nature (WWF) began working with other local villagers in 2015. The village would be paid 40,000 rubles(卢布)at the end of the year if the image of a snow leopard is caught. The WWF also rents horses from the villagers so that they do not need to make money by poaching anymore. "Today there are far fewer leopard poachers but leopards still get caught in traps set for other animals, so I have to stay watchful," said Markov.

Changing guns for cameras has made a big difference in the lives of these former poachers, the village, and the Russian snow leopards. The number of snow leopards has been rising and their population is expected to recover to normal levels within 10 years.

Help Hermit Crabs(寄居蟹)

Hermit crabs are nature's recyclers. They eat waste and help keep the ocean and shores clean. Unlike other crabs,the hermit crab has a thin outer shell over its soft tail. This makes the hermit crab easy prey for hungry attackers. Hermit crabs stay safe by living in old seashells. A hermit crab is picky(挑剔的);it tries on many shells until it finds one that fits just right. In recent years,however,many hermit crabs have had trouble finding their perfect homes. What is the problem?There are not enough shells to go around!

One reason for the seashell shortage is that ocean water is not as clean as it once was. This has caused chemical changes to sea water. Some sea animals,like snails,are affected by these changes. Now there are fewer snails making shells. People visiting the beach often take shells home as souvenirs(纪念品). This is another problem. Other people even hunt and take shells for their own pet hermit crabs! They do not realize that hermit crabs in the wild need those shells, too.

Now people are aware of that and working to solve this hermit crab housing shortage. They are teaching beach-Boers to leave seashells where they belong—at the seashore! Some people even make fake seashells that they hope the hermit crab will like. For example,a group called Project Shelter invited people who visited their website to create different designs for hermit crab shells.

These designers had a lot to consider. What kind of material should be used to build seashells?The material must be light enough for the hermit crab to carry,but strong enough to protect the crab from attackers. The man-made shells could not contain glue or any other substance(物质) that might harm the hermit crab. Another challenge of building a hermit crab home was the opening of the shell. Too big would mean the crab would not feel safe. Too small would be uncomfortable,and the crab would not want to move in.

The Project Shelter shells are placed in the wild for hermit crabs to find. Lucky hermit crabs can move into these new dream homes.

Once upon a time，there lived in Basra an old man.His only job was caring for and loving his only son who was a handsome young man.The old man put all his money into his son's education.The young man went away for a few years and received an education at a well－known university，where there were many scholars (学者)．

The day arrived for the son to return from his studies.When the son came and met his father，the old man looked into his eyes and felt great disappointment."What have you learnt，my son？" he asked."I have learnt everything that was to be learnt，father，" the son said.

"But have you learnt what cannot be taught？" asked the father."Go，my son and learn what cannot be taught，" said the old man.

The young man went back to ask his headmaster to teach him what cannot be taught."Go away to the mountains with these four hundred sheep and come back when they are one thousand，" said the master.

The young man went to the mountains and became a shepherd (牧羊人)．There for the first time he came across silence.He had no one to talk to.The sheep did not understand his language.Hopelessly，he would talk to them but they would look back at him as if to say he were stupid.Slowly but certainly，he began to forget all his worldly knowledge and his pride.He became quiet，wise and humble (谦逊的)．

At the end of two years，when the number of sheep had grown to one thousand，he returned to his master and fell on his knees."Now you have learnt what cannot be taught，" said the master.

The United Kingdom, Great Britain, Britain, England--many people are  (confuse) by what these different names mean. So what is the  (different) between them, if any?  (get) to know a little bit about British history will help you solve this puzzle.

In the 16th century, the nearby country of Wales was joined the Kingdom of England. Later, in the 18th century, the country Scotland was joined (create) the Kingdom of Great Britain. In the 19th century, the Kingdom of Ireland was added to create the United Kingdom of Great Britain and Ireland. (final), in the 20th century , the southern part of Ireland (break) away from the UK, which resulted the full name we have today: the United Kingdom of Great Britain and Northern Ireland. Most people just use the shortened name: "the United Kingdom" or "the UK". People from the UK are called "British", means the UK is also often (refer) to as Britain or Great Britain.