Top lists are lecturing people on everything from “100 places to visit” to “100 books to read”. Aren't you just tired of being told what to do with your time?

    Now you have a list to end all lists!

    Take a look at the following two examples from the list of “101 thins not to do”:

    Swim with Dolphins?

    Swimming with dolphins is one of the world's most profitable tourist activities. However, every dolphin will welcome having their busy, tiring day interrupted by tourists screaming pushing around them in the water. Worse yet, when dolphins get too near to the boats loaded tourists, they could get caught up in ropes and killed by propellers(螺旋桨).

    Here's a little secret. Dolphins look like smiling at you, but actually they're just opening mouths.

    Go to see the Mona Lisa?

    There must be something about the mysterious smile. The 6 million people who visit the lady in the Louvre every year can't all be wrong, after all. But they can be quite annoying, standing in front of you, holding up their cameras to prevent you from seeing anything. In fact, it is hard for you to see the painting clearly because you have to stay away from it for security reasons. After queuing for hours, many tourists can remain in front of the painting only for 15 seconds most.

    If the mysterious lady in the picture knew her fate, she wouldn't just be smiling, she'd be laughing.

    So, still long to see the Mona Lisa? If you want to find out more about the list, read 101 Things NOT to Do Before You Die. Visit www. not2dobeforeidie. co. uk and buy the book at a 20% discount.

    If two scientists at Los Alamos National Laboratory are correct, people will still be driving gasoline powered cars 50 years from now, giving out heat-trapping carbon dioxide(二氧化碳) into the atmosphere—and yet that carbon dioxide will not contribute to global warming.

    In a proposal by two scientists, vehicle emissions(排放) would no longer contribute to global warming. The scientists, F. Jeffrey Martin and William L. Kubic Jr., are proposing a concept, which they have named Green Freedom, for removing carbon dioxide from the air and turning it back into gasoline.

The idea is simple. Air would be blown over a liquid solution of potassium carbonate, which would absorb the carbon dioxide. The carbon dioxide would then be put to chemical reactions that would turn it into fuel(燃料): gasoline or jet fuel.

    This process could change carbon dioxide from an unwanted, climate-changing pollutant into a vast resource for renewable fuels. The cycle—equal amounts of carbon dioxide produced and removed—would mean that cars, trucks and airplanes using the synthetic(合成的) fuels would no longer be contributing to global warming.

    Although they have not yet built a synthetic fuel factory, or even a small model, the scientists say it is all based on existing technology. “Everything in the concept has been built, is operating or has a close cousin that is operating.” Dr. Martin said.

    The Los Alamos proposal does not go against any laws of physics, and other scientists who have independently suggested similar ideas. Dr. Martin said he and Dr. Kubic had worked out their concept in more detail than former proposals.

    There is, however, a major fact that explains why no one has built a carbon-dioxide-to-gasoline factory: it requires a great deal of energy.

    According to their analysis, their concept, which would cost about $5 billion to build, could produce gasoline at an operating cost of $1.40 a gallon and would turn economically practical when the price at the pump hits $4.60 a gallon.

    Other scientists said the Los Alamos proposal perhaps looked promising but could not evaluate it fully because the details had not been published. “It's definitely worth pursuing,” said Martin I. Hoffert, a professor of physics at New York University. “It's not that new an idea. It has a couple of pieces to it that are interesting.”

    Are you dreaming of taking a trip on your own? Here is some advice on how to make your once-in-a-lifetime journey and how to stay safe when you get there.

    Before you begin to look at places, activities and plane tickets, you must set a budget. When you search through the websites about travelling, it can be so easy to add another week here or there, or choose an extra activity. Setting a budget can avoid（避免） creating a huge bill, which starts very small.

    With so many countries on this planet, it is difficult to decide where to go. By narrowing down your search to voluntary (自愿的) work or a relaxing holiday, you can save a lot of time looking through websites.

    After deciding where to go, you need to research the country. Find out when each season is. It would be disappointing if you were taking part in an outdoor-based activity and it rained most days. Look into medical information, as you may need certain medicine for certain countries. Above all, make sure you can afford to go to this country and take part in the activities you have dreamt about. Don't raise your hopes too high before you know for certain it is within your budget.

    By carrying a credit (信用) card with you at all times,  it is possible to stop yourself getting lost. Mobile phones are very important as well. However, do not depend completely on them, since electronic machines can break without warning. Therefore, always carry a list of emergency (紧急情况) phone numbers, names and addresses. Finally, learn a little of the language. Do not expect that the people there speak your own language. After all, you are in their country.

    I just celebrated my 95th birthday last week, and people always ask me about my secret. Of course, it's important to eat right and exercise, but that's not much of a secret. I actually have quite a few friends over the age of 90, and we all say the same thing: laughter. Are we telling jokes all the time? Not necessarily. Are we watching funny movies around the clock? Of course not. Do we take the time to laugh at ourselves and generally try to keep things light as much as we can? Certainly. One of the best ways to make sure you laugh every day is to be around children or pets because they just can't help being funny! And what about those polite little laughs when your neighbor tells a joke that isn't really funny, but you laugh anyway? Those are fine, but the ones where you laugh with your whole body and mind are the ones where you end up tired and out of breath, where everyone around you starts laughing, too. My “senior” friends and I even came up with a nice round number: For each full “belly laugh” you have, you'll live one extra hour in your lifetime. Now that might not sound like much, but if you have one every day, you'll live an extra three or four years. I try to have between five and ten of those laughs every day, and so should you.

    People have understood that kindness is good for the person who receives help. For example, when we give food to a hungry person, he is blessed. However, scientists have recently begun to study the effect kindness has on the person giving it. What they have found is that doing good is good for the doer. Acts of kindness can improve health, help a person reach goals and even add years to a person's life.

    The first study to show the connection between doing good and living a long life was a study on aging. Beginning in 1956, scientists studied a group of married mothers for 30 years. They thought the women with the most children would die first. But the number of children a woman had did not matter. Wealth did not matter. Education did not matter. What did matter was whether they volunteered. Women that volunteered had fewer diseases during their life.

    Many other studies have found the same positive effects. Helping other people improves long-term health. The gains are the same for men, women, old people and the young. Those who volunteered had fewer serious diseases than those who did not volunteer. This included diseases such as heart attack, cancer and stroke.

    Scientists are researching many possible causes. One possible cause is an increase in antibodies （抗体）, which help fight against disease. One study showed the body produces more antibodies after an act of kindness. This increase in antibodies can last nearly an hour after one act of kindness is finished.

    Another one is an increase in a chemical that fights the effects of stress from life. Scientists have found a link between being kind to people and an increase in the chemical oxytocin. Oxytocin is a chemical produced in the brain. It reduces many of the harmful chemicals the body produces under stress.

    Most Americans see their pets as family members, surveys show. Those with dogs are more likely to call themselves pet "parents" than pet "owners". There are more of these parents than ever. In big cities such as San Francisco and Seattle,(owned) dogs outnumber children.

    The ways in which companies are profiting from the trend are also becoming various. Kinds of dog food and various pet mattresses (垫子) are always in hot sale. And it is not surprising that, for pets, Americans spent more than $400 million only on Halloween costumes this year. Overall, annual spending on pet food and products in America has risen by around 40% over the past ten years.

    Now a pack of startups have sensed a fresh opportunity.

    Much as Airbnb has offered travelers another choice instead of staying in a hotel, two firms, Recover and DogVacay, want to give pet owners an alternative to kennels (养狗场) when away from home. The cost is around $30 a night, with the majority of that going to the sitter, who takes care of the dog, and around a fifth to the company﹣much less than you would spend to check your dog into a kennel.

    The other big sellingpoint is that pets will receive better treatment. There are ways, apparently, to vet (审查) dog hosts to the real pet lovers: only around 15% of those who apply to serve as sitters are passed. Besides offering more attention and room, Rover has launched a feature that helps customers to see how far their dog has been walked via the GPS in the host's phone. Like Airbnb, both DogVacay and Recover insure stays against accidents.

    Another advantage of the model is that consumers often use dog-sitting services many times a year, and they tend to be loyal. That has helped DogVacay and Recover attract a lot of money﹣around $140 million between them.

    But firms that connect pets with hosts will face great competition as they try to go global. Companies offering homestays for dog rapidly appear in many different countries, including Australia, Brazil and Britain. And unlike Airbnb, which pulls in customers thanks to its presence in lots of markets that people want to travel to, the network effect for services like DogVacay is local.

    Despite having predicted the trend early, such firms may never achieve the same scale as an Airbnb. But then no one ever said it was easy to be top dog.