Nowadays there seems to be an app for everything. And mobile apps have been a part of our life. The following apps are part of the most popular apps.

    If you want to learn anything at school, you need to listen to your teachers. Unfortunately, millions of kids can't hear what their teachers are saying. And it's not because these students are goofing off. Often, it's the room's fault. Building architecture and building design can create echo(回声)-filled classrooms that make hearing difficult.

    Children with hearing impairments（损伤）suffer most from noisy classrooms. They sometimes can't hear questions that other students ask in class. Compared with kids with healthy hearing, they have a harder time picking up new vocabulary words by hearing them in talking.

    Even kids with normal hearing have a harder time in the classroom when there's too much noise. Younger children in particular have trouble separating important sounds – like a teacher's voice – from background noise. Kids with learning disabilities and speech impediments（障碍）and kids for whom English is a second language also have a harder time learning in noisy situations.

    In recent years, scientists who study sound have been asking schools to reduce background noise, which may include loud air-conditioners and pipes. They're also targeting outdoor noises, such as highway traffic. Noise reduction is a big deal. Why? Because quieter classrooms might make you smarter by letting you hear your lessons better.

    “It's so obvious that we should have quiet rooms that allow for access to the lesson,” says Dan Ostergren, a hearing scientist. “Sometimes it surprises me that we spend so much time discussing this topic. I just want to go. Why is this hard for anyone to grasp?”

    Still looking for a job? Here are some opportunities for you!

    Housekeeper

    We are looking for someone to clean the houses of two families with pets on a weekly basis. There is a part-time position that would average 10 to 15 hours per week. We're looking for someone who is interested in this type of work. This position requires a driver's license and your own car. Previous experience is needed.

    If you're happy with the duties and scheduling, please contact us for an interview. Our number is 256883-4598.

    Life Insurance Agents

    Lincoln Heritage Life Insurance Company is the Nation's Leader in Final Expense. The Lincoln Heritage Funeral Advantage@program is an affordable and convenient way for individuals to get Final Expense life insurance. No experience needed. If you are interested in making a career for yourself, call us today! 888 713-6020.

    Truck Driver

    You will earn up to &1,500 weekly PLUS get home weekends. You'll never be far from home and you'll be earning great pay. Don't let this limited opportunity pass you by. Call Mainstream today and get on the road to be your own BOSS!

    Qualifications:

    A clear driving license.

    6 months over-the-road driving experience required.

    Tel:485 353-235

    Dental Assistant

    A general dentistry office is seeking a dental assistant.

    Qualifications:

    High school graduate in the US, Dental Assisting Certification, X-ray license, 2 years of experience.

    Fluent in Spanish and being able to work on Saturday is required.

    Full-time is preferred. However, a part-time option would be considered.

    If interested in this position, please call 256 882-4800 for additional information.

    For thousands of years, people thought of glass as something beautiful to look at. Only in large glass windows. Glass bottles and jars that hold food and drink allow us to see the contents. Glass is used to make eyeglasses, microscopes, telescopes, and many other extremely useful and necessary things.

    Until the Second World War, most of the glass used for optical (光学的) instruments was imported from Europe. However, during the war Americans could not get European glass, and they were forced to make their own. Therefore, new kinds of glass were developed that had been previously unknown. These new effects were achieved by mixing other chemical elements with the sand. Some of the new glass is very strong and can resist many kinds of shocks. Legend (传说) has it that a kind of very hard glass was invented by a Roman who showed his discovery to the Emperor. When the Emperor saw the glass he feared that it would become more valuable than gold and sliver, making his treasure worthless. Therefore, he had the glass-maker killed, and the secret was not discovered again for hundreds of years.

    In the present century, safety glass was invented for use in modem cars and planes. Safety glass is made by placing a layer of plastic between two layers of plate glass. When the outside layer of glass is broken, the pieces do not scatter (散开) and injure people. Some glass of the type is strong enough to resist bullets (子弹).

    Although nowadays plastics have replaced glass under conditions where glass might be easily broken, there are new uses being developed, for the greatest advantage of glass is that its component (组成的) parts are inexpensive and can be found all over the world.

    Companion planting is the idea that some kinds of plants can help each other grow. Plants that are compatible (兼容的，能共处的) together generally have similar needs in terms of nutrients, soil and moisture levels.

    Advice about which plants are compatible is sometimes based more on tradition than proof. But experts say there is evidence to support certain combinations. These can improve harvests, reduce disease and help with pest control by attracting helpful insects.

    For example, some kinds of soil bacteria take nitrogen from the air and make it into a form that plants can use. The plants hold the nitrogen in their roots. Legumes (豆科植物) are especially good at this nitrogen (氮) fixing. Then any crops that share the same space with the legumes can get the nitrogen when the roots are broken down.

    Beans and potatoes can also share territory well because their roots reach different levels in the soil. Deep-rooted vegetables get nutrients and moisture from lower down in the soil, so they do not complete with plants with shallower roots.

    But some plants placed together may harm each other's development. For example, tomatoes do not like wet soil but watercress does, so you would probably want to keep them separated.

    Some kinds of produce should be kept apart even after being harvested. This is because of ethylene gas (乙烯气体). Ethylene is a plant hormone (激素) that can cause some foods to ripen too quickly. Apples release ethylene gas. Apricots, melons and tomatoes also release a lot of ethylene. Some vegetables are easily affected by ethylene, including asparagus, broccoli, cabbage and cucumbers.

    This risk of ripening too soon is why markets often separate high ethylene-producing foods from those that are sensitive to the gas. But if you put an apple in a bag with a green banana, the ethylene from the apple will make the banana ready to eat sooner.

    What about peaches, plums and nectarines? These kinds of fruit do not need any help from an apple—they release enough ethylene to ripen themselves. But that does not mean there is no way to get the job done faster.

    Growers suggest placing the fruit in a fruit bowl or in a paper bag with the top folded over. Keep the fruit at room temperature, out of direct sunlight. Once the fruit is soft enough, either use it or put it in the refrigerator to keep it from getting too ripe.

Rachel Carson was a science writer widely respected for her books about oceans.But she also devoted years to gathering scientific research that would awaken the public to the dangers of modern chemical pesticides.Her work,Silent Spring,became one of the most influential books of the 20th century.And it launched the modern environmental movement.

Born in Pennsylvania,she became a marine scientist working for the US government,primarily as a writer and editor.Her first three books,Under the Sea-Wind,The Sea Around Us,and The Edge of the Sea were physical explanation of life in and near the sea.They made Carson one of the best-known and respected science writers.But then she turned her time and talents to a new subject.

Carson had been concerned about the dangers of the pesticide DDT since the mid-1940s.At first DDT was a symbol of the progress of modern chemistry.It had saved countless lives by killing lice and mosquitoes that spread deadly diseases.But Carson doubted whether spreading large quantities of poison throughout the environment could be completely safe.She painstakingly gathered research to prove that the chemical industry was overconfident about the safety of chemicals that hadn't been tested.

Carson published her research as a book,Silent Spring,in 1962.It caused an uproar.Carson was immediately attacked by the chemical industry.Millions of citizens tuned in to watch a television program analyzing the issue.Carson's calm and reasoned arguments turned the audience in her favor.Finally,her work convinced the president to call for an investigation.Eventually 12 of the most toxic chemicals Carson wrote about in Silent Spring,including DDT,were banned or cancelled.She grew physically weak and endured a lot of pain.Yet she refused to stop working on the book.She died on April 14,1964,at the age of 56.Her writings helped move the nation toward a new understanding of how humankind depends on the interconnection of all forms of life on Earth.