The first week of my summer campaign has been quite an experience! I'm learning the ups and downs of guiding this new journey,and I'm soon finding my footing in the wonderful world of support raising.

    Some may ask: Why do you choose a job where support raising is necessary? Why not just find a ministry that will support you without having to do any extra work?

    I had a wonderful support meeting this week where I was able to have some very good conversations with the lady I was sharing with.It blessed my soul to see her eyes light up with the same passion（热情）I felt in my heart about the ministry I was sharing with her.I kept thinking in my head "I've shared my passions with her,and she gets it."At the end of our meeting she decided to become a donor,but she gave me something extra that I haven't received from anyone else.She gave me a handmade wooden cross,small enough to carry with me.

    As soon as she handed it to me,I knew it was a gift sent from God,through an act of friendship.It's a symbol of a partnership that is developing through this journey,a symbol of how God can send us messages and a symbol of new friendships to come throughout the summer and my time in the middle east.Finally,it's a symbol of the example of what it looks like to build relationships with people who will join you in sharing with the world.It's something I'll treasure through the rest of my summer campaign,through my service in the middle east,and the rest of my life.

    The US teenager Thomas Cheatham had planned to study Latin during his time at Hebron High School in Texas. But when he learned that the school district was going to offer a Mandarin class, he quickly changed his mind.

    “I thought Mandarin would be more beneficial than Latin,” said Cheatham, who is now in his second year of studying the language. He speaks Mandarin to order food at Chinese restaurants and can read social media posts from his Chinese-speaking friends.

    While it's a difficult language to master, the high school junior, who plans to study computer engineering, thinks it will be important for his career. “Chinese is a good language to know, especially with China becoming a growing power,” he said.

    Many experts agree that proficiency in a language spoken by a billion people worldwide will give American students an edge in the global economy. “People are looking at China as our next economic competitor, and interest in Mandarin is growing,” said Marty Abbott, executive director of the American Council on the Teaching of Foreign Languages. “We're seeing it in all parts of the country. ”

    Abbott estimates that as many as 100, 000 students are now studying Mandarin throughout the US, in public and private schools. She said the US government has designated (指定) Mandarin as a “critical needs” language and provides professional development programs for teachers. “Our government wants to increase our language competency for national security and economic competitiveness,” Abbott said.

    At the same time, the Chinese government is spreading knowledge of the Chinese language and culture through Confucius Institutes established in many US states. For example, the Confucius Institute at the University of Texas in Dallas has been the home of a Confucius Institute for 10 years. It sponsors Confucius Classrooms at 21 local public and private schools, where tens of thousands of students are learning Mandarin.

    "An apple a day keeps the doctor away." Similarly, if we drink a little more water every day, we may find that we need to go to the doctor a lot less often. A healthy diet is made up of water and a great many different kinds of foods. We know that healthy foods like fruits, vegetables and fish, are important as they provide us with energy and fiber, without giving us too much fat and sugar. But why is water important?

The human body needs water to survive. Water is important as it carries poisons and waste out of our bodies. However, doctors advise us to drink plenty of water, much more than the small amount we need to stay alive.

    Some doctors believe that water is important for our health in all kinds of ways. They believe that a great many illnesses and health problems start as a result of dehydration (脱水)-—a lack of water in the body. Most people are dehydrated at least some of time, although they probably don't know it. It is surprising to learn that if we feel thirsty, we are already in the first stage of dehydration. In fact, we are advised to drink water before we feel thirsty.

    These doctors think that health problems such as headaches, high blood pressure and asthma (哮喘) could be helped if people drink more water. They also believe that drinking more water can help people who are overweight. Water contains no calories so it will not make us put on weight. If we drink water, we will probably drink less sugary soft drinks such as Coca-cola. Doctors also believe that drinking more water may stop people from overeating. They say that many people think that they are hungry when they are, in fact, thirsty. Doctors suggest, therefore, that we eat less food and drink more water. There are still many health problems that cannot be solved by drinking water, so we should not stop going to seeing the doctor completely. However, if we make a decision to drink water every day, we may find that we need to go to the doctor a lot less often.

    When you think back to the blackboard from your school days, what color is it? Chances are that it's green. So what's up with the name? Originally, blackboards were really black. Before wall-sized blackboards existed, late 18th-century students used their own mini boards made of slate (石板) or painted wood, according to Concordia University, Those first boards were, in fact, black, and they paved the way for the larger ones.

    In 1800 when a Scottish headmaster named James Pillans wanted his students to draw maps, the students couldn't draw the maps their teacher wanted on their tiny boards, so Pillans put several slates together to create a large board. Problem solved! From there, the idea spread quickly as teachers could finally show a concept to the whole class at one time. By 1815, the massive writing spaces were common enough to earn their own name: blackboard.

    The color change came in the 1960s when companies sold, steel plates, coated with green enamel (漆) instead of the traditional dark slate. The new material was lighter and less fragile than the first blackboards, so they were cheaper to ship and more likely to survive the journey. Teachers weren't complaining either. After all, the new "greenboards" made the chalk powder easier to erase. Plus, the enamel left less of a glare and the color was nicer to look at. At that point, people started using the word "chalkboard "as a more accurate descriptor, but "blackboard" still stuck around.

    Gardeners such as Prince Charles who claim that talking to plants encourages them to grow have long been seen as a little silly. But scientists have discovered evidence which suggests the Royal may actually be right and they could be listening to him. Biologists at Tel Aviv University in Israel have found that flowers can act as a plant's "ears" to help them detect the sound of approaching insects.

    When the researchers played recordings of flying bees to evening primrose flowers, within three minutes the sugar concentrations in the nectar (花蜜) of its flowers increased. The fluid, produced to attract pollinating (授粉) insects, was on average 20 percent higher in flowers exposed to the buzz compared to those left in silence or exposed to higher pitched sounds. Professor Lilach Hadany, who led the study, said: "Our results document for the first time that plants can rapidly respond to pollinator sounds in an ecologically relevant way."

    However, Prof Hadany said a plant's ability to respond to pollinators may be weakened in city environments or beside a busy road. While plants require water, sunlight and the right temperature to grow, it is widely believed they do not have senses in the way animals do.

    But the study, published on the open-science website BioRxiv, suggests the efforts of gardeners who talk to their plants may not be in vain. "Plants' ability to hear has implications well beyond pollination—plants could potentially hear and respond to herbivores, other animals, the elements, and possibly other plants," Prof Hadany added.

    A month-long experiment conducted by the Royal Horticultural Society in 2009 found female voices appear to speed up the growth of tomatoes. The research offers a possible explanation — women's voices were at the right frequency for the plants to hear.

On account of the government shutdown, many of the city's best attractions, such as the national museums, are closed. It may affect your social plans. That's especially true if you have out-of-town visitors coming to the District. Don't worry! For every closed museum, we've offered up a suitable substitute that is privately run, thus not subject to the shutdown. Here's where you can go instead.

Anacostia Community Museum and the National Museum of African American History and Culture

Alternatives: Banneker-Douglass Museum or Alexandria Black History Museum

The National Museum of African American History and Culture is one of the hottest draws on the National Mall, with free tickets taken weeks in advance. Its sister museum, the Anacostia Community (社区) Museum, takes a community-focused look at African American history. So does the Banneker- Douglass Museum in Annapolis, which traces (追溯) the African American experience in Maryland, and the Alexandria Black History Museum, where exhibitions honor local activists and explore the influence of slavery in the area. And unlike the African American Museum, neither requires you to plan ahead.

Hirschhorn Museum and Sculpture Garden

Alternative: Glenstone

Wandering through the galleries at Glenstone, you'll come across some of the biggest names in 20th century art — Jackson Pollock, Jean-Michel Basquiat and Robert Rauschenberg. Glenstone sits on a 230-acre estate (土地) that doubles as an outdoor sculpture garden. Free tickets for Glenstone are often reserved weeks in advance, but 72 free tickets are available every day for anyone who takes a Montgomery County Ride-On Bus from Rockville Metro Station to the museum.

National Museum of African Art

Alternative: The African Art Museum of Maryland

Masks, musical instruments and jewelry can be found in Fulton, where the African Art Museum of Maryland houses a collection of traditional and contemporary African artworks and objects. And the best part, for visitors on a budget? Admission is free.