Often a nickname is a shortened form of a person's name, and it can also be a descriptive name for a place or a thing. Many American cities have nicknames. These can help build up an identity, spread pride among citizens and build their unity. Nicknames can also be funny.

    Los Angeles, California is the second largest city in population, after New York City. Los Angeles has several nicknames. One is simply the city's initials, L.A. It is also called the City of Angels because Los Angeles means "the angels" in Spanish.

    Los Angeles often has warm, sunny weather. So another nickname is City of Flowers and Sunshine. New York is called The Big Apple. So Los Angeles is sometimes called The Big Orange because of the fruit that grows in that city's warm climate.

    The American movie and television industries are based in Los Angeles. So it is not surprising that it is called The Entertainment Capital of the World. Many films are made in the area of Los Angeles called Hollywood. Millions of people visit the area. No trip to Los Angeles is perfect without seeing the word "Hollywood" spelled out in huge letters on a hillside.

    Many movie stars live in Los Angeles. The city is sometimes called Tinseltown. This nickname comes from the shiny, bright and often unreal nature of Hollywood and the movie industry.

    Another nickname for Los Angeles is La-La Land, using the first letters of Los and Angeles. This means a place that is fun and not serious, and maybe even out of touch with reality.

    A good place for watching unusual-looking people is Venice, an area on the west side of Los Angeles. A system of waterways designed after the Italian city of Venice has been built there. Many people love Los Angeles for its warm sunny weather, beautiful mountains and beaches, and movie stars. That includes Randy Newman, who sings about his hometown.

    On the whole, Los Angeles is growing attractive just for its rich nicknames.

The Best and Worst Things to Buy in March

Frozen food

    Grocery store ads aren't the only places to find deals on freezer-section treats. To take advantage of the deepest discounts, combine coupons (优惠券) from sponsoring brands, such as Dole, Green Giant and Tyson Foods, with grocery store sales. Plus, look for printable savings on Coupons.com and EasyHomeMeals.com. Brands participating in National Frozen Food Month will offer more than 180,000 coupons that make frozen food among the best things to buy in March.

Boxed chocolates

    If you desire to give a gift to a friend in March, consider chocolate. Two minor holidays in March provide the perfect excuse: National Chocolate Caramel Day on March 19 and National Chocolate-Covered Raisin Day on March 24. You can discover chocolate deals online as well as in stores. Head to sites like RetailMeNot.com to find discount coupons for boxed chocolate savings of 10 percent or more.

New cars

    With the latest car models filling dealers' lots, you'll have a hard time finding discounted models from the year before. Car dealerships are less motivated to offer steep discounts from March through May. Instead, plan to buy your car during the fall or winter. You should also research the auto you want at TrueCar before heading for the dealership. The site offers information on what people in your area paid for vehicles equipped with the options you want.

Spring clothing

    When warm weather makes you want to head outdoors, resist the urge to do so wearing the latest fashions. You won't find March deals on swimsuits, Easter dresses or other spring items. To find discounts on clothes of this spring, hold off until Memorial Day weekend. You can also look for online and in- store savings at Amazon, Macy's, Saks Fifth Avenue and other retailers.

    Are you using a dating App to make friends? How do you know that Ben from London is really 25-year-old? Is his photo taken recently? Is his name even Ben? Dating apps can be tricky to operate, particularly when you're trying to know whether someone is trustworthy, but one thing you can't cheat is your gene, which is why a new dating app is using DNA as a basis for its match.

    A dating app named Pheramor requires all users to hand in a cheek sample, from which a team of in-house scientists using a specially-created tool can queue the specific genes connected with attraction and then identify which users might be suitable. The process works by separating the 11 genes that link to our pheromones（信息素）, the chemical signals that are believed to control one's attraction. Combining this data with the personal information allows the app to make very specific matches.

    “Pheramor uses both your biology and your social technology: we collect your genetic data through a cheek sample and collect your like, dislikes, and interest from your social media introductions like Facebook, Twitter, etc,” the app's website explains. “All of them will be used in our specific software, which is designed to learn what you prefer.”

    The co-founder Brittany Barreto, who has a PHD in genetics added that Pheramor's technology digs deeper than traditional dating apps, making it almost impossible for people to cheat their way to a date.

    The Houston-based app is already up and running but hopes to be officially put into market in February with 3,000 members.

    Regulating a complex new technology is hard, particularly if it is evolving rapidly. With autonomous vehicles(AVs) just around the corner, what can policymakers do to ensure that they arrive safely and smoothly and deliver on their promise?

    The immediate goal is to make sure that AVs are safe without preventing innovation. In America, experimental AVs are allowed on the road in many states as long as the companies operating them accept responsibility. Chris Urmson of Aurora says American regulators have got things right, working closely with AV firms and issuing guidelines rather than strict rules that might prevent the progress of the industry. “It's important that we don't jump to regulation before we actually have something to regulate.” he says.

    On the other hand, Singapore's government has taken the most hands-on approach to preparing for AVs, says Karl Iagnemma of Nutonomy, an AV startup that has tested vehicles in the city-state. For example, it has introduced a “driving test” that AVs must pass before they can go on the road. This does not guarantee safety but sets a minimum standard.

    Elsewhere, regulators have permitted limited testing on public roads but want to see more evidence that the vehicles are safe before going further, says Takao Asami of the Renault issan-Mitsubishi alliance(联盟). “Simple accumulation of mileage(里程) will never prove that the vehicle is safe.” he says. Instead, regulators are talking to car makers and technology firms to develop new safety standards. Marten Levenstam, head of product strategy at Volvo, compares the process to that of developing a new drug. First, you show in the laboratory that it might work; then you run clinical trials in which you carefully test its safety and efficiency; and if they are successful, you ask for regulatory approval to make the drug generally available. Similarly, autonomous cars are currently at the clinical-trial stage, without final approval as yet. It is not possible to prove that a new drug is entirely safe, but the risk is worth taking because of the benefits the drug provides. It will be the same for AVs, he suggests. After all, nowadays human-driven vehicles are hardly risk-free.

    The European Parliament has approved a law banning a wide-range of single-use plastic items, such as straws and cotton buds by 2021. "Europe is setting new standards, paving the way(铺路) for the rest of the world," the European Commission's vice-president Frans Timmermans, who is responsible for sustainable development, said in a statement.

    The new plans come after the EC found that plastics make up more than 80% of marine litter, which has disastrous effects on wildlife and habitats. The EU parliament notes that because of its slow rate of breaking down, plastic residue(残余) has been found in marine species as well as fish and shellfish - and therefore also makes its way into the human food chain.

    Under the new European law, tobacco companies will be required to cover the costs for the collection of cigarette butts. Manufacturers of fishing tools will also have to pay for the retrieval(找回) of any plastic nets that have been left at sea. There's also a new focus on further raising public awareness, where producers of items such as tobacco filters(滤嘴), plastic cups, and wet wipes will be required to clearly explain to users how to appropriately dispose of them.

    The European Commission first suggested the ban in May, which was approved by member states in October. China last year banned the import of 24 varieties of solid waste, including types of plastic and unsorted paper, putting pressure on Europe to deal with its own waste.

    The World Economic Forum estimates that there are about 150 million tons of plastic in the world's seas. A study published in Science in 2015 suggested that between 5 and 13 million tons more are flowing into them every year. Research shows there will be more plastic than fish by weight in the world's oceans by 2050, which has encouraged policymakers, individuals and companies into action.

    We have many trips for you to explore the world your way. Our travel ideas are as diverse as the world itself and are designed to let you experience it. Please start with the following four trips.

Athens and Crete Explorer

London for Families

Australia & New Zealand

Classic Egypt