If you want to slow aging, you might want to eat less. This finding is good news—if you were a mouse. The researchers studied mice, not people.

    John Price and other researchers studied two groups of mice. One group was able to eat as much as it wanted. The researchers limited what the mice in the other group ate. Their diet had 35 percent fewer calories than the first group of mice.

    Price says the mice with the diet restrictions were “more energetic and suffered fewer diseases.” They were not just living longer but seemed to stay younger for a longer period of time.

    The researchers found that fewer calories slow down a natural mechanism in cells called ribosomes. Price explains that ribosomes are responsible for making important proteins in the cells. But with fewer calories, they slow down. This gives the cells more time to repair themselves.

    The researchers say ribosomes use from 10 to 20 percent of the cell's energy to make those proteins. Price wrote that “because of this, it is impractical to destroy an entire ribosome” when it starts to break down. However, “repairing individual parts of the ribosome on a regular basis enables ribosomes to continue producing high quality proteins for longer than they would otherwise. This top quality production, in turn, keeps cells and the entire body functioning well.”

    Price said, “ribosome is a very complex machine, like a car.” They need “maintenance to replace the parts that wear out the fastest. When tires wear out,” he explained, “you don't throw the whole car away and buy a new one. It costs less to replace the old tires.”

    “Food,” he said, “isn't just material to be burned—it's a signal that tells our body and cells how to respond.” Price said the findings help to explain how exactly our bodies age. And this may “help us make more educated decisions about what we eat.”

    To be honest, I do not know Sybrina Fulton. Nor can I claim to understand the depth of her pain. Yet, we share a deep connection. A common feature experienced by those women who face the challenge of raising a Black male child in a nation that far too often views Black male bodies through fear. You see, Ms. Fulton is living my nightmare (噩梦). A constant worry that has stayed in the back of my mind since the birth of my eldest son, some sixteen years ago.

    Through the years, I have witnessed the world's reaction to my son evolve as he has grown from a small boy to a young man. In his early years, his easy smile and lovable character were nothing less than magnetic (有磁性的). Complete strangers would approach him in the street, draw him into conversation, and find themselves easily struck by his lively spirit. Even at that time I worried, how would my son react when in the years to come some of those who found themselves so impressed by this cute, intelligent boy, might grasp their purse tighter as he walked by.

    Over the years I have sought to protect his spirit from the hurt that comes from undeserved hatred. I have also sought to arm him with the knowledge that could one day save his life. He knows, for example, that if he is ever pulled over by the police, that he is to keep both hands on the wheel at all times and only reach for his license when the officer is specifically observing his actions. He knows, even in less threatening situations, that rough play and loud interactions with his buddies of any color will be viewed very differently when he does it, than when his white friends display the very same behavior. Still, the truth of the matter is, no amount of advice or voiceless behavior overcomes the physical, immovable fact of the color of his skin. His intelligence, easy smile, and lovable character won't protect him from unfounded assumptions of criminality.

    What makes the Trayvon Martin travesty (歪曲) of justice so painful to me, personally, is the knowledge that Trayvon's mother loved her baby no less than I love mine. The various pictures of moments throughout a happy childhood that have now found a home on nationwide newscasts provides clear evidence of that. Yet no amount of love and care, and no words of advice could have saved her son from the cruel killing he faced at the hands of a self-appointed neighborhood watch-dog. And perhaps even worse, nothing could have prepared her for the inhuman way her son has been treated by officials even in death. To think for three long days, his parents searched for him while officials failed to inform them of his fate and instead, performed drug and alcohol tests on his lifeless body, while failing to do the same for his attacker—the only one of the two who indeed had a criminal past is frankly, unforgivable. To know that the words of her son's killer were given more weight than eye-witnesses and taped evidence of her child's screams and eventual death must be heartbreaking. But to also have to live with the fact that his attacker still breathes free while her son lays buried underground is certainly more than any sorrowful parent should have to endure (忍受).

    It is this type of pain that is not unfamiliar to the Black experience in America, for this is the Black mothers' burden. A burden we have endured for centuries. Yet, there is still the rightful expectation, that in modern-day America, the wheels of justice would not be stopped.

    So today, it is my hope that Trayvon's mother, father, family and friends can take some comfort in the fact that millions of Americans of every color stand with them in their fight for justice. This is a burden no family should have to endure alone.

    We will not give up. We will not forget. We will continue the fight until justice is done.

    Metal-organic frameworks(MOFs) are compounds that are set to solve some tough challenges: producing water in the desert, removing greenhouse gases from the air and storing dangerous gases more safely.

    The Arizona desert is really dry. Anyone stuck in it without water would die from dehydration (脱水) within three days. Unless, that is, they had one of Omar Yaghi's next-generation water harvesters. Although daytime humidity(湿度)is only about 10 per cent, this rises to 40 per cent at night, which means there's enough water in the atmosphere to support life — if it can be transformed into liquid form.

    That's exactly what Yaghi's device does. It's a box about the size of a small microwave oven designed to suck the humidity from the air at night and turn it into drinking water the next day using only the heat of the sun as its power source. What makes it work is a special material called a metal-organic framework (MOF), which at normal temperatures attracts water molecules (分子) onto its surface of its internal pores(细孔). Warm it up and the water is released, each harvest producing one-third of a cup of pure drinking water.

    "With further improvements, a device, the size of a washing machine, could produce enough water for the basic needs of a household," says Yaghi, a chemist at the University of California. One-third of the world's population lacks safe drinking water; for them such a device could be a lifesaver.

    These crystalline cluster(结晶群)of metals, such as aluminum or magnesium, linked by organic molecules can be made into materials with an extremely high absorption ability, attracting specific molecules to their surface. In this way, MOFs cling to a variety of liquids and gases.

MOFs work thanks to their unique structure—large quantities of nanometer-sized internal spaces. In fact one MOF has so many pores that they would cover an area as large as six football fields. MOFs are also extremely stable light and have many different uses: their molecular structure can be varied to attract specific molecules, such as water, and their pores can be designed to best store them. Adding a small amount of heat or pressure causes the MOF to release what it is holding. More than 70,000 different MOFs have been produced to date for various applications.

    India has a very vast history and heritage (遗产). The country has witnessed some of the most important events in the past and every event has an effect of its own on the culture, religion, lifestyle, and economy of the country. This is one of the leading reasons why tourists prefer India to travel and explore. Historical tours in India provide everything that a traveler expects from his/her journey. These historical tours give an opportunity to study and explore Indian history.

    Historical tours of India generally consisted of four phases: ancient, medieval (中世纪的), modern India and contemporary (当代的) India. Some of the historical travel packages are:

    Forts and Palaces

    The rich cultural past of India is reflected in the countless forts (堡垒) and palaces across the country. Most of the forts were constructed as a defense device to keep the enemy away and palaces were made on the names of the kings and queens. Some of the famous forts and palaces are: Agra Fort (Agra), Fatehpur Sikri (Agra), Hawa Mahal (Jaipur), Amber Fort (Jaipur), City Palace (Jaipur), Gwalior Fort (Gwalior), Mysore Palace (Mysore), Red Fort (Delhi), etc.

    India Heritage Tours

    The main purpose of India Heritage tours is to make Indians as well as tourists familiar with the rich Indian legacy (遗产). The heritage of the country is at least 5000 years. Some of the heritage tours are: medieval heritage, Rajput heritage, Golden Triangle, splendid Gujarat, etc.

    South India Historical Tours

    The Southern India is known for its diversity and there are many places, which (景区) in South India include Goa, Cochin, Kerala, Munnar, Periyar, Kottayam and the list goes on and on.

    Life is filled with regrets (遗憾). Anyone around you will have no difficulty in telling his regrets. As we get older, we look back and wish that we had made better choice. {#blank#}1{#/blank#}

    Make better plans

    If you start to do something, you need to make a plan before doing it. The earlier, the better.

    You will know what comes first and what comes last. {#blank#}2{#/blank#} If changes happen, you can have more time to deal with them.

    Live a more active life

    You can go around more often. More outdoor activities can keep you relaxed and active. {#blank#}3{#/blank#} "Thank you" can bring a smile to someone's face. Learn to say "sorry" and don't be angry with others.

    {#blank#}4{#/blank#}

    A friend may make your life and he or she can break your life as well. So you have to think twice when you choose a friend. Good friends will always give you better ideas. When you get into trouble ask others for help. That little help may get you good results.

    Never fear failure

    Everybody fails. Even the greatest person fails before he or she achieves success. We should not fear failure, because failure is not the end of the road. {#blank#}5{#/blank#}

    Life is good. We don't have to live in our past, but we do hope that we can plan better, live better, and work better when we have the chance to do so.

A. Ask others for help.

B. Find the right friend.

C. You also need to be kind.

D. What can we do to avoid future regrets?

E. Regrets play an important part in our daily life.

F. We must take failure as a chance to learn and improve ourselves.

G. You'll also know what you should do and what you shouldn't do.

We all love eating out.But,is it bothering you because you are on a diet and have to dine with a friend?Sure,you will be concerned about the amount of calories,fat or salt in a restaurant's menu items. {#blank#}1{#/blank#}

Choose the right place.

Always plan ahead when you know that you have to dine out.Look for the restaurants that serve delicious meals that are low in fat.{#blank#}2{#/blank#} You're more likely to overeat there.Once you've decided the place,get familiar with their food menu.Decide what you're going to order before you go.

Start with a soup.

One easy approach to stick to your diet when eating out is starting with a soup.{#blank#}3{#/blank#} This will keep you from sitting hungry and filling you up.A soup is the first course that you order when eating out.

{#blank#}4{#/blank#}

Salt improves food's flavour and is often used heavily in restaurant meals.When you dine out,ask the attendant to prepare food without added salt.Ask about the ingredients to see if there are items that may be higher in salt.Moreover,it is better to limit the use of condiments(调料)such as mustard,ketchup,pickle and sauces as they may contain salt that you don't need.Instead of salty appetisers(开胃小吃),choose fruit and vegetable salad.

Don't eat it all.

{#blank#}5{#/blank#} To avoid overeating,you can split a meal with a companion or put half the meal in a plate and leave the rest.

Sticking to a healthy diet doesn't mean you have to turn down everyone's offer when asked to eat out.

A.You have to be very particular about serving sizes when dining out.

B.Just make sure you make healthier choices.

C.Avoid eating at places that offer all-you-can-eat buffets(自助餐).

D.Here are four tips for eating out while you are on a diet.

E.Cut the salt intake.

F.Avoid eating too much.

G.Order vegetable or bean-based but avoid cream-based soups.