We brush our teeth daily, but do you know everything you need to know about dental care and hygiene? Believe it or not, there is a lot more than most people realize. Luckily, here are several apps that can help you.

●Brush DJ

    You should brush your teeth for full two minutes as recommended by dentists, but that time can be difficult to judge. Many recommend you listen to music, because many songs are just around two minutes in length. Brush DJ has loads of great tunes that will get you into the two­minute habit. There are both songs to listen to, and videos to watch, and you'll find a variety of awesome tunes.

●Orasphere

    It's recommended that Orasphere videos be used by dentists for their patients, so they can learn about procedures. Those who do use these videos say that the software can greatly decrease the amount of time it takes to explain procedures to patients.

●American Dental Association(ADA)

    Everything you ever wanted to know about your teeth, and then some, can be found on the American Dental Association(ADA) website. You'll find loads of great articles that have the latest news about dentistry（牙科）. Those interested in dental careers will find plenty of information to head them in the right direction, and there's even a section devoted to public dental programs, including Give Kids a Smile and Fluoride in Water.

●DDS GP

    Here is more presentation software that explains all types of dental procedures. This is helpful for dentists to have, because they can better explain procedures to their patients.

●Dentistry IQ

    You can find information for dentists, hygienists, assistants, office managers, and more at Dentistry IQ. You can also get information about new products, clinical practices, and much more. In addition, you can learn about career opportunities, the most recent practices, and a whole lot more.

Cure for tiredness?

    Staying up late is a potential battle between parents and kids. But the solution could be as simple as changing your meal time.

    Researchers at the University of Surry, UK, found that delaying meals could help change one of the internal body clocks. Besides a “master” clock in the brain, there are clocks in other parts of the body. They are usually synchronized according to factors including light.

During the study, researchers tested 10 participants to examine the effect of changing meal times on their body clocks. The participants were given three meals —breakfast, lunch and dinner. In the first stage, participants received breakfast 30 minutes after waking. Lunch and dinner followed, after 5-hour intervals. In the second stage, each meal was delayed by 5 hours. Right after each stage, blood and fat samples were collected.

    Results showed that later meal times greatly influenced blood sugar levels. A 5-hour delay in meal times caused a 5-hour delay in the internal blood sugar rhythms.

    The discovery showed that meal times are in line with the body clock that controls blood sugar levels.

    This is a small study but the researchers believe the findings could help jet lag sufferers and night-shift workers.

    In a study by the University of Surrey in 2013, researchers explored what happened when a person's body was changed from a normal pattern to that of a night-shift worker's.

    After people work through the night, over 97 percent of the body's rhythmic genes are disrupted（扰乱，使混乱）.

    These findings explain why we feel so bad following a long flight, or after working at night, according to Simon Archer, one of the study's researchers.

    “It's like living in a house. There's a clock in every room in the house and in all of those rooms those clocks are now disrupted, which of course leads to chaos in the household,” fellow researcher DerkJan Dijk told the BBC.

Changing meal times didn't affect the “master” body clock — the one controlling when we get sleepy — but it can reset the body clock that controls blood sugar levels. This wouldn't necessarily cure jet lag completely, but it might reduce the negative effects.

A study published earlier this year suggested that just a weekend camping trip could be enough to reset our body clocks. And now this latest research shows regular food schedules could play a key part too.

    Businesses are finding more uses for Virtual Reality (VR) as the technology develops. VR is no longer only for gaming or enjoyment. An American company called Blue Goji is using VR to improve one's health by making exercise more fun.

    Blue Goji has offices in Austin, the capital of Texas. The company showed its cardiovascular (心血管的) workout machine, called the Infinity treadmill (跑步机), at the recent South by Southwest festival, an event held every year in Austin.

    A person using the treadmill wears a virtual reality headset when exercising. Before starting, the user tightens a belt to prevent falls. Then, the user plays a VR game while running on the machine. The game can transport the user into the virtual world, where he or she can be racing against virtual people.

    Recently, Leonardo Mattiazzi tested the Infinity treadmill. Mattiazzi said he had a strong feeling to actually get running and do something that pushed his limits. He said the experience was more interesting than running inside the gym without actually going anywhere.

    Constam said the active use of virtual reality helps solve a common problem while wearing a VR headset. She noted that a lot of VR experiences cause motion sickness because people are in motion during the game, but not moving in real life. But when the user is moving on the treadmill and in the game, the chances of motion sickness are reduced.

    However, users who tested the treadmill while wearing the VR headset each had a different experience. Constam said there generally is a learning curve for VR. The first time users feel lost, but "the more you do it, the more you get used to it," she said. Mark Sackler was a first time user. He said he felt a little sick at one point during the game. But he thought the experience was surprisingly realistic.

    After carefully studying the users' experiences, Blue Goji plans to make the treadmill available to the public in 2019.

    The spine (脊柱) stands at the center of your health, providing your body with structure and support. It also contains a major collection of nerves that deliver electric signals from the rest of the body to your brain. So it's important to take care of it.

    Staying in a good position is one of the most important things to keep your spine healthy. A proper position means standing or sitting while keeping your spins straight, except for its natural bending. Positions play a vital part even when you're asleep. Stomach sleeping is far from a good idea. Many people prefer sleeping on their side, which is in the interests of their spine. Sleeping on your back has lots of benefits yet can cause lower back pain and put some pressure on your spine.

    Staying still for too long — even if your position is good — can be hard on your back. Especially if you work at a task most of the day, it's important to get up and stretch (伸展) periodically. Strength exercises with light weights like push-ups can also help by strengthening the muscles. However, don't overdo the exercise, as repeated movements can hurt the muscles around the spine, as trying to lift heavy weights with poor technique.

    Vitamins also affect the health of your spine. In particular, vitamin B and omega-3 fatty acids help keep nerves healthy. Another important part is vitamin D, which is required for strong bones. Vitamin D can come from some foods, but it's also absorbed from sunlight, so it may help to do some exercises outside. At last, many of the actions necessary to keep a spine healthy are similar to those used to protect your health in other ways. So protect your back, and the rest of the body will benefit.

    When I'm in Italy, I generally only eat Italian food. I doubt whether there's another country in Europe that has food that can keep me coming back for more.

    To eat well in Italy, finding the right restaurant is essential. I appreciate personality-driven restaurants, run by people keen(热衷的) to share their love of good cooking, and places serving family recipes. Signs of a good restaurant include a low-rent location, lots of locals, and a small, handwritten menu in one language. The menu is small because they're only selling everything they're cooking; it's handwritten because it's shaped by what is fresh today in the market; and it's in one language because they mostly serve locals.

    For a fast and cheap lunch, I look for Italian food in corner delis (熟食店): either a rosticceria, specializing in roasted meats and antipasti(开胃食物), or a hot table bar — a cafeteria offering a buffet of meat and vegetables. Another option is to drop by a neighborhood grocery store to pick up some cold cuts, cheeses, and other foods for a picnic.

    Italians tend to spend a long time on each course, and dinner is the evening's entertainment. For example, when you have a full-blown Italian dinner in a restaurant, you don't get out until midnight; a three-hour meal is common. Waiters often provide lots of drinks that seem designed to keep you from leaving. When you want the bill, you'll have to ask for it. To "eat and run" is seen as a lost opportunity.

    A couple of years ago, I sat down at my favorite place in Verona, Enoteca Can Grande, with my friend and guide Franklin. We let the chef, Giuliano bring us whatever he wanted. Just after the antipasti arrived, Franklin's wife phoned him and said, "Don't eat too much cheese or dessert." Later Franklin, who was not thin, surveyed our table. Sighing, he said, "The foods are so plentiful but I can eat few."

    "That's a pity," I said.

    I enjoyed the food for three hours and he watched me eating for three hours. Eating in Verona was really an amazing experience.

There are various reasons why people compose poetry.The distinctive characteristics of poetry often include economical use of words,{#blank#}1{#/blank#}(describe) and vivid language,integrated imagery,literary devices and{#blank#}2{#/blank#}(arrange) of words,lines,rhymes,and rhythm.Poets use many different forms of poetry to express{#blank#}3{#/blank#}(they).Now I'll introduce some simpler forms to you.

Nursery rhymes are{#blank#}4{#/blank#}(usual) the traditional poems or folk songs.The language of nursery rhymes is{#blank#}5{#/blank#} the point and has a storyline.Nursery rhymes have a strong rhythm,and often repeat the same words.Therefore,children enjoy them.They are easy{#blank#}6{#/blank#}(learn) and recite.Children learn about language by playing with the words in nursery rhymes.

The list poem contains a list of things,people,ideas,or descriptions that develop a particular theme.It has a flexible line length and repeated phrases{#blank#}7{#/blank#} give both a pattern and a rhythm to the poem.

The cinquain is made up of five lines.The poet can convey{#blank#}8{#/blank#} strong picture or a certain mood in just a few words.

Haiku is a Japanese form of poetry that{#blank#}9{#/blank#}(consist) of 17 syllables.It has a format of three lines,{#blank#}10{#/blank#}(contain) 5,7,and 5 syllables respectively.Haiku is easy to write and can give a clear picture and create a special feeling using very few words.

English speakers also enjoy poems from China.A lot of Tang poetry has been translated into English.