“How's it going? ” I ask the barista(服务生). “How's your day been?”

    “Ah, not too busy. What are you up to?”

    “Not much. Just reading. ”

    This，small talk, is one of the key rituals(规矩）of American life. It has taken me only a decade to master.

    I immigrated to the United States in 2001, for college. I brought only my Indian experience in dealing with shopkeepers and tea sellers. In Delhi, where I grew up, when doing business, people don't ask each other how the other's day has been. They might not even smile. The customer doesn't tremble before complaining about how cold his food is. Each side believes the other will cheat him.

“God, Mahajan, you're so rude to waiters!” Tom, an American friend, said, laughing, after he watched me ordering food at a restaurant, in the West Village, years ago. Considering myself a mild and friendly person, I was surprised. Tom always asked servers how they were doing or praised their shirts or made jokes about the menu. At that time, this seemed dishonest to me. Did he really like what they were wearing?

American life is based on a principle that we like one another but won't violate one another's privacies. This makes it a land of small talk. Two people greet each other happily, with friendliness, but might know each other for years before asking basic questions about each other's backgrounds. The opposite is true of Indians. At least three people I've sat next to on planes to and from India have asked me, within minutes, how much I earn as a writer (only to turn away in disappointment when I tell them).

Living in Brooklyn and then in Austin, Texas. I made coffee shops the places of my movements. Meeting the same baristas day after day produced context, and I got practice. I was beginning to fit in. It felt good and didn't seem fake anymore.

    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.

    Scotland has long been characterized as a land of romance. It contains ruins of many ancient castles and abbeys，and there is an attractive beauty in its mountains，long deep valleys，and ribbon lakes. Each year those things attract a great number of tourists.

    Numerous islands line the coast. In the north are two large groups，the Orkney Islands and the Shetland Islands. Close to the west coast are the Inner and Outer Hebrides groups，and the islands of Arran and Bute.

    The land may be divided into three regions: the Highlands in the north，the Central Lowlands and the Southern Uplands.

    The Highlands are wild and picturesque(如画的). A long valley called Glenmore crosses the Highlands from southwest to northeast.

    In the south of the Highlands are the Grampian Mountains，highest in the British Isles. Ben Nevis，the highest peak，rises to 1，243 meters. Ben Lomond rises from the shore of Loch Lomond，Scotland's largest freshwater lake.

    The Central Lowlands run from southwest to northeast and the greatest length is nearly 145 kilometers. The soil here is fertile，and there are four coalfields underlying the area. In the east is Edinburgh，Scotland's historic capital city，and in the west is Glasgow. Almost 90 percent of Scotland's population live in the Lowlands.

    In the Southern Uplands，the hills are generally less than 600 meters high. Their rounded or flat tops are often capped with dark peat(泥炭). Along the slopes are plants like grass and heather(石南花).

    Being able to take advantage of truly unlimited data is a smartphone user's dream, but everyone I've talked to about 5G is more excited about the usage unlocked by next - generation wireless devices. From smart home security to self - driving cars, all the Internet - connected equipment in your life will be able to talk to each other at lightning - fast speed with reduced delay.

    "5 G is one of those forerunners, along with artificial intelligence, of this coming data age," said Steve Koenig, senior director of market research for the Consumer Technology Association. "Self - driving vehicles are emblematic in this data age - they show application of data completely. With one single task, driving, you have large amounts of data coming from the vehicle itself, and a variety of sensors (传感器)are collecting a lot of information to model its environment as it moves. It's pulling in data from other vehicles about conditions down the road. There's lots of data behind that task, which is why we need the speed and lower latency ((延迟).

    AR glasses and virtual (虚拟的)reality headphones haven't yet been inside the mainstream, but tech companies are joyfully saying that such equipment will eventually replace our smartphones. With 5G, that could actually happen. This is notable because companies such as Apple are reportedly developing AR glasses to improve - or even replace - smartphones.

    Ericsson showed at February's Mobile World Congress in 2019 how smart glasses could become faster and lighter with a 5G connection, because instead of being weighed down with components, the glasses could rely on outside equipment for processing power.

    But don't get too excited. There's still a lot of work to be done in the meantime, including some necessary testing to make sure the radio plays nicely with basic systems and service construction so that 5G isn^'t concentrated only in big cities.

    America is the world's largest food exporter. But the worst drought in half a century is hitting corn and wheat harvests. The drought across the central United States adds to concerns about world food supplies and prices in the coming years.

    Experts say by 2050, the world will have to produce at least sixty percent more food to feed a population growing bigger and bigger. China, a major food importer, is looking for producers around the world to guarantee future food supplies.

    China has invested in food production in Australia and New Zealand. A new source of supply is Ukraine. Ukraine was known as the breadbasket of Europe because of rich corn and wheat harvests a century ago.

    Galyna Kovtok is chief executive of Ukraine's largest agricultural business, ULF. She predicts that within a few months her company will be approved to export corn to China. That will make Ukraine the first country outside the Americas to do so.

    ULF will soon have almost two million tons of elevator storage capacity as it prepares for the Chinese market. Chinese money is financing the building of six grain elevators. But the company's equipment is largely American, including half-million-dollar John Deere combines to harvest wheat.

    ULF'S grain production per hectare (公顷) is now halfway between Ukrainian averages and the high yields of the American Midwest. But farming depends on the weather. Across the Black Sea region—in Ukraine, Russia and Kazakhstan--drought this year is pushing harvests down by fifteen to twenty percent.

    Traditionally, the Black Sea region is the main source of wheat for North Africa and the Middle East. But this year, on the supply side, Russia may have to stop exports. And, on the demand side, Africa and the Middle East are now competing with China.

    At the same time, a new report says large parts of Asia may face long periods of severe drought within ten years. It says northern China, India, Afghanistan, Mongolia and Pakistan will be especially hard hit. It says other parts of Asia are likely to face longer and wetter monsoon seasons (雨季) because of climate change.

    I stood outside my front door catching my breath. After a lazy Christmas holiday, I had to recover from climbing stairs with carry-on bags and a suitcase. I looked up and blinked. Red tape crossed the door. I didn't understand Hungarian, but the one English word said enough: "POLICE".

    Google Translate told me I would be arrested if I entered, so I didn't. Finally, I called my rental agent. He went to the police station for more details.

    My agent returned with authorization to enter. Not only were my files undisturbed, but so were the TV and printer. The burglars had taken a few items from the top drawer as well as a small amount of foreign currency in the bottom drawer. Somehow they hadn't found the jewelry box in the third drawer.

    I was in shock. My agent's words were fuzzy, something about fixing the locks tomorrow and making a list for the police.

    Then one day, I remembered that I'd left another jewelry box in the flat. My heart sank as I thought of another locket that had been in that box, a gold engraved one with a picture of my late honey Grandma inside. When I realized the box was missing, the whole experience seemed to crash down on me. I cried.

    At the end of January, I received a registered letter from the police. The burglar hadn't been found, and the case was closed. I slept with my purse by my bed. I hid my laptop when I showered. And then another challenge rose. I was unexpectedly laid off.

    Then one July night, I reached into my third drawer, pulled out my jean shorts, and heard a small thud. I looked down and blinked: It was the tiny jewelry box I thought had been stolen six months earlier.

    Inside was the locket with honey Grandma smiling at me, being there for me, telling me not to give up. I started to cry.