Americans drove more miles in 2015 than any year since the U.S. government started keeping records 45 years ago. The U.S. Department of Transportation (USDT) recently reported that Americans drove a record of 3.148 trillion miles last year. In case you are wondering, that is enough to take 337 round trips from Earth to Pluto.

    There are a number of reasons why Americans are driving more miles. The social experts agree that the first is the price of gas, which has dropped to the level of the year 2004 in the past year. The American Automobile Association (AAA) said that the average price of gas was just $1.71 a gallon. That could be the lowest price since 2004.

    P.J. Sriraj, a director of the Urban Transportation Center at the University of Chicago, notes that the lower cost to fill up a car is just one reason. Another reason is that more Americans are back to work after the 2008 economic recession, and they drive to their jobs.

    Besides, more Americans have to travel a long distance every day between home and the office. There are a lot of Americans who must travel more than 45 miles per day for their jobs. And as for many, there is not enough public transportation.

    Because of the heavy traffic, roads are becoming more and more crowded. While modern cars are more fuel-efficient, the improvement is not enough to offset more cars on the road. “There is no doubt that driving more will make the air dirtier,” said P.J. Sriraj. And many Americans showed a great concern in a recent survey.

    Humans' invention of zero was vital for modern mathematics and science, but we're not the only species to consider “nothing” a number. Parrots and monkeys understand the concept of zero, and now bees have joined the club, too.

    Honey bees are known to have some numerical skills such as the ability to count to four, which may come in handy when keeping track of landmarks in their environment. To see whether these abilities extended to understanding zero, researchers trained 10 bees to identify the smaller of two numbers. Across a series of trials, they showed the insects two different pictures displaying a few black shapes on a white background. If the bees flew to the picture with the smaller number of shapes, they were given delicious sugar water, but if they flew toward the larger number, they were punished with bitter-tasting food.

    Once the bees had learned to consistently make the correct choice, the researchers gave them a new choice: a white background containing no shapes at all. Even though the bees had never seen an empty picture before, 64% of the time they chose it rather than a picture containing two or three shapes, the authors report today in Science. This suggests that the insects understood that “zero” is less than two or three. And they weren't just going for the empty picture because it was new and interesting. Another group of bees trained to always choose the larger number tended to pick the nonzero image in this test.

    In further experiments, the researchers showed that bees' understanding of zero was even more complex: for example, they were able to distinguish between one and zero-a challenge even for some other members of the zero club. Advanced numerical abilities like this could give animals an evolutionary advantage, helping them keep track of predators（捕食者）and food sources. And if an insect can display such a thorough grasp of the number zero, write the researchers, then this ability may be more common in the animal kingdom than we think.

    In today's world of smart phones and laptops, most people have at least one time-telling thing with them. Since these digital products are so common, is time running out for the 500-year-old watch? According to some consumers, the answer is yes. New Jersey teenager Charlie Wollman says a watch is “an extra piece of equipment with no necessary function.” Many young adults think so and use their smart phones to tell time. It is said that fewer young people wear watches today than ten years ago. As a result, some people say that the watch industry is at a crossroads.

    However, watchmakers optimistically say that watches redeem（挽回）popularity when consumers reach their 20s and 30s. By then, they are willing to spend money on a quality watch that doesn't just keep good time. Fifty years ago, watchmakers took pride in their products' accuracy（精确性）. But in recent years, the watch industry has changed itself into an accessory(配饰) business. And today, the image a watch conveys has become more important than the time it tells.

    "Complications" features that go beyond simple timekeeping — are an important part of a watch's image. Today's watches offer lots of features that meet almost any personality. These features include compasses, USB drivers, and even other functions that measure the effectiveness of golf swings!

    Creativity also plays a key role in designing today's watches. For example, Japanese watchmaker Tokyoflash makes watches that don't even look like watches. The company's popular Shinshoku model uses different color lights to tell time. It looks more like a fashionable bracelet than a watch.

    Whether a watch conveys fashion sense, creative talent or a love of sports, consumers want their watches to stand out. Nowadays, everyone has the same kind of gadget（小玩意） in their bags, so people want to make a statement with what's on their wrists. Will this interest in wrist fashion last? Only time will tell!

    This may be sad to hear, but the number of Britain's famous red telephone boxes has been falling for decades. The phone box is well-known to foreign fans of Britain and visitors to the country. There are still many left to enjoy, however.

    There is deep feeling for the bright red boxes with the Queen's coat of arms (盾形徽章). The places that still have the red box are mostly small and in the countryside. In these places, the phone box may be a symbol of community, as well as a landmark (地标).

    But there are still several cities, including London, that still have original red phone boxes in place.

    For tourists, they probably make the perfect place for a selfie (自拍照). Visit London any day in the summer and you'll see people with their smartphones taking photos with the red box behind them. People who receive the photo will have no trouble guessing where the selfie was taken.

    Ever since mobile phones became more widespread, there has been less and less point in public phones. But although the red boxes are no longer popular places to make a call from, new uses are being found for them all the time. The famous design created by Giles Gilbert Scott back in 1924 lives on, but in ways the British architect (建筑师) would never have imagined.

    Some of the new ways the phone boxes are being used are quite unusual. For example, some have been changed into tiny coffee shops. Others are hat stores. In one distant area of the country, a red box that had not been used for a long time has been turned into a small lending library.

    Even back in their heyday in the last century, phone boxes were put to other uses. Some people even used them as toilets in an emergency.

But for many, they were a safe place to hide if you were caught up in the rain. Britain's weather is unpredictable: sun one moment, heavy rain the next. So if you are planning to visit the UK and want the perfect British selfie, standing inside a red telephone box in a rainstorm may be your best bet.

    Ride-hailing apps and robot cars promise to change how we get around and the effects are already being felt. Traffic in New York is slowing down. Jams are common in Manhattan, especially in its business districts. Daytime traffic in the busiest areas now moves almost 20% more slowly than it did five years ago.

    It seems a place ripe for wide use of ride-hailing apps that, you might think, would reduce some of the jams. However, those apps appear to be making things worse as traffic has slowed in line with the growing popularity of apps such as Uber and Lyft, a study by transport expert Bruce Schaller suggests.

    Over the four years of the study, the number of cars in Manhattan seeking ride-hailing fares increased by 81%. There are now about 68, 000 ride-sharing drivers across New York. That's about five times the number of the yellow cabs licensed to operate there, he found. There are so many drivers, his work suggests, who spend about 45% of their spare time just touring for fares. That is a lot of unused cars blocking a lot of busy streets.

    Simple physics explains why ride-sharing vehicles are causing, not curing jams, said Jarrett Walker, a public transport policy expert who has advised hundreds of cities about moving people.

    "Lots of people are deciding that, 'Oh, public transport is just too much trouble this morning,' or whenever, which causes a shift from it," he told the BBC. "That means moving people from larger vehicles into smaller ones, which means more vehicles to move the same people. Therefore, more traffic."

    Data gathered about ride-sharing drivers illustrates how they contribute to congestion (塞车), said Prof. Christo Wilson, a computer scientist at Northeastern University who has studied the services. "You can look at the traffic pattern for the Uber vehicles and it perfectly matches the peaks for the rush hour and the peak time of a day," he said. They are out there in force at the worst possible times.

How much of your monthly grocery list ends up in the garbage? A new study reveals the average American spends nearly $1,500 per year on food they'll never eat.

A recent survey of 2,000 Americans reveals the average shopper wastes $1,493.93 on food per year. That's almost a fifth of their grocery bill after every shopping trip. One tenth of respondents claim they "never" purchase food they don't end up eating, while three in 10 say this is something they "always" do.

Half of respondents prefer to head to the grocery store alone, and when they do, half are more likely to stick to their list and 36% are less likely to buy food they don't want or need.

Keeping the list in mind is important, as 38 percent are more likely to let food be wasted if it wasn't originally on their shopping list. Seven in 10 add that when they go to the store on an empty stomach, they're more likely to buy foods they won't eat. So they don't do that that way. Some respondents appear to be in a wasteful cycle when it comes to food waste. Nearly half usually buy and end up wasting the same food every month because they think they'll get around to eating it.

"We can all do better to limit food waste by sticking to grocery lists and, when we get home, prioritizing eating our foods that are_perishable, like fruits, vegetables, and dairy products" says Avocado Co-Founder and CMO Mark Abrials in a statement.

Three-quarters feel guilty about throwing away uneaten food because it's a waste of money — and 48 percent feel the same, due to the harm food waste causes to the environment. "When it comes to food waste, nobody is perfect," Abrials adds. "But in order to consider our environmental impact, not to mention wasted money, we think it's essential to be thoughtful about everything we purchase — whether that's food, mattresses or other goods."