It encouraged us to visit Quora. com, the online question and answer community, to find out how users get the most out of every tank of gas.

    Light makes right

    Alex Elderfield noted that excess weight prevents an engine from burning fuel efficiently. "Only carry what is essential in your car, clean out any junk or necessary items otherwise you are paying for the fuel to cart these from place to place," he wrote.

    Driving smoothly — that is, not mashing the gas and then slamming the brakes later down the road — was a fixture of many responses. Quora user Clint Law agreed on that advice, who wrote, "Every little bit of kinetic energy that your brakes lose, your engine burned in fuel to build up." Overbraking should consequently be viewed as wasted acceleration. "That's really what kills your fuel economy," he argued.

    Keep the pressure up

    Keeping the recommended tire pressure for your car was another mantra among Quora users. Marlyn Rosent said she checked her tire pressure every time she filled up her SUV. Quora user Doug Dingus checks his tire pressure every weekend. “Less tire contact means reduced rubbing, requiring less fuel,” he said.

    Air conditioning or windows

    Though the summer heat get many drivers to roll up the windows and turn on the air conditioning, some people argued that running the A/C wastes too much gas. In between were many shades of grey.

    Achilleas Vortselas said it would depend largely on a car's speed. He wrote that as a general rule, people should drive with the windows down around the city and turn the air conditioning on when hitting the highway, where a car's aerodynamic(空气动力的) characteristics would be influenced by opened windows.

    More seriously minded people, however, said to travel as much as possible with windows up and the A/C off. Eddie Xue gets by with just a wisp of outside air. “Use the fan and open your windows every now and then at lower speeds," he wrote.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

    Do you love holidays but hate the increase weight that follows? You are not alone. Holidays are happy days with pleasure and delicious foods. Many people, however, are worried about the weight that comes along with these delicious foods.

    With proper planning, though, it is possible to control your weight. The idea is to enjoy the holidays but not to eat too much. You don't have to turn away from the foods that you enjoy. The following suggestions may be of some help to you.

    Do not miss meals. Before yon leave home for a feast(宴会),have a small, low-fat snack(小吃). This may help to keep you from getting too excited before delicious foods. Begin with clear soup and fruit or vegetables. A large glass of water before you eat may help you feel full. Use a small plate; a large plate will encourage you to have more than enough. Better not have high-fat foods. Dishes that look oily or creamy have much fat in them. Choose lean meat(瘦肉 ).Fill your plate with salad and green vegetables. If you have a sweet tooth, try mints (薄荷) and fruits. They don't have fat content as cream and chocolate.

    Don't let exercise take a break during the holidays. A 20-minute walk after a meal can help burn off excess(过多的) calories.

    TRAVEL TIPS & INFORMATION

    Drukair flight timing

    Due to the geographical location, Paro airport in Bhutan is severely dependent on weather condmons, so the schedule timings are likely to change without advance notice Travelers are therefore, requested to check with Drukair offices for the latest information. Drukair rights without assigning any reason to cancel, reschedule, or change the route of the journey. The reporting time for your flight is two hours before flight departure (离开). All counters will close 40 minutes before scheduled departure of the flight.

    Documents Required for travel by Air (in case the passenger is a patient)

    ⒈Fit to travel by air certificate signed by a physician.

    ⒉Child Health Card or Birth Certificate if the patient is minor and travelling to India and passport if travelling to other countries.

    ⒊Reservation of 5 seats in case stretcher (担架) is required and your reservation should be one day ahead of departure.

    ⒋Passengers with walking difficulties should request for wheelchair assistance at the check-in counters.

    For all travel requirements, please contact the nearest Drukair booking office or a travel agent.

    Security

    According to security regulations, passengers are advised:

    Not to accept any baggage/ packet from unknown persons.

    Not to leave baggage unobserved at anytime especially within airport area.

    Unattended baggage may be removed by Airport/ Security staff as object of suspicion.

    To declare before check-in, if carrying any arms or explosive substance.

    To remove battery cells/ dry cells from radios, transistor sets, two-in-ones and other such electrical/ electronic items and hand them over to the airline staff before security check or carry them in registered baggage.

    Snorkelling in Silfra

The clear water at this UNESCO world heritage(遗产) site in Thingvellir National Park will leave you speechless. It is one of the highest rated dive sites in the world. During this journey, you will snorkel within a crack between the Eurasian and American continents. You'll experience truly amazing views of the colorful underwater landscape, marine life(海洋生物), and geological formations. Silfra's water is fresh and drinkable at around 2℃ - 4℃ all year round. Visibility can reach more than 100 meters, and swimming often feels more like flying.

    This trip is for anyone who knows how to swim and is up for a unique adventure. We offer transportation with a pick-up in Reykjavik, and provide you with a dry suit. The total length of the tour is approximately five hours, and includes in-water snorkelling lasting around 30 minutes. We'll guide you through the main Silfra Big Crack, Silfra Hall, Silfra Cathedral and Silfra Lagoon.

Included:

    All necessary snorkeling equipment;

    Hot drinks and food;

    Silfra entrance fee of 1,000 ISK.

    Availability: All year at 09:00 and 15:00. Pick-up in one hour before.

    Requirements:

    Participants need to complete the Silfra medical statement before the tour.

    Divers must:

    Be at least 18 years old (young people under 18 years old need a signature from their legal guardian), and the maximum age is 65 years old;

    Be able to communicate in English.

    Be physically fit;

    Not be pregnant;

    Not be under the influence of alcohol or drugs;

    Sign a medical form.

    Apple and Microsoft each launched new products. One company astonished everyone. The other made people sleepy. Can you guess which was which? You probably guessed wrong. Because Apple, famous for its creative products, was the tech giant whose new product caused a collective shrug. While Microsoft, which stole a move out of the Apple Playbook, won cheers from high-end, creative-class consumers like business analysts, media designers and music producers.

    As Hayley Tsukayama remarked at The Washington Post, the Surface Studio, one of Microsoft's new products, is really just a super-sized version of the Surface Books product that Microsoft has been selling for years. But if you've ever watched science fiction movies like Minority Report-- where Tom Cruise seems to operate pictures and data hanging on mid-air by touching them, spreading his fingers to increase on details, and sending files and information sliding from one folder to another with a click of the finger, you can see how Microsoft is trying to show the same experience.

    Meanwhile, apple's new products were almost like some fine promotions for its Apple TV. They boast that the new Macbook Pro has a smaller size and more functions, and a new touch screen bar on laptop keyboards where function keys used to be.

    So what's going on? In many ways, Apple is focusing on attracting the average consumers who have been attracted by Microsoft. And Microsoft is focusing on targeting the high-end professionals Apple has historically been associated with. You can even see this is the companies' ad campaigns: Microsoft's ads stress imagination and creativity, while Apple's commercial chief performance and convenience of its Macbooks.

    So Apple is trying to control the world of devices and laptops from the top down, starting with the high-end market and moving on to appeal to a broader base of consumers. Microsoft, having already strengthened itself within the bigger low-end market, is now attempting the opposite with a bottom-up strategy. Will they succeed? Time will tell...

A seismic (地震的；重大的) shift in climate science might be heating up.

New research shows that sound waves, produced by earthquakes can be used to measure temperatures in the ocean which traps 90% of the heat Earth absorbs from the sun，making long-term changes in ocean warmth, a major factor in how the world might respond to global warming.

For years the main approach of measuring ocean temperature has been Argo, an array (阵列) of 4000 automatic floats, which drifts the globe, sampling ocean water and measuring its temperature. Yet Argo measurements stop at 2000 meters.

The new technique called "Seismic Ocean Thermometry", would be especially useful in detecting long-term changes in ocean temperatures deeper than Argo's reach.

"Ocean Acoustic Tomography", the basis for the current research, was first tested nearly 30 years ago. The initial studies created sound waves artificially, basically increasing the volume on giant underwater speakers. Scientists measured the sound's travel time from the speakers to receivers thousands of kilometers away. Because ocean temperatures affect the speed of the waves, the researchers could calculate average temperatures along their paths. But some believed the noise was a threat to ocean life and the technique never took off.

The new study instead uses a natural sound source for investigation: earthquakes making a low, continuous noise beneath the seafloor off the coast of Sumatra that drum up sound waves in the ocean. On the shores of the Chagos Islands in the East Indian Ocean, between 2005 and 2016 Seismic Station Diego Garcia recorded seismic waves produced by those earthquakes. Some of those waves created physical changes in land and sea as they traveled. Others were sound waves or T waves that moved through the deep ocean, delivering valuable data about ocean temperature.

12 years of data coupled with mathematical models pointed to a temperature change of roughly 0.044 degrees per decade, a trend larger than those predicted by Argo. The findings suggest that Seismic Ocean Thermometry is a feasible method to measure changes in ocean temperature. Further data from other regions of the globe and other timeframes would help improve the warning models and predictions.

And in future studies the researchers plan to listen directly for sound waves, using a network of hydrophones, microphones which detect sound waves under water. Sound waves set the tone for a deep dive into our warming oceans even if they fail to reach 60000 miles under the sea?