It's a popular belief that a fish's memory lasts for only seven seconds. It may seem sad to think that they don't remember what they've eaten or where they've been, and they don't recognize you or any of their friends — every moment in their life would be like seeing the world for the first time.

    But don't be so quick to feel sorry for them. A new study has found that fish have a much better memory than we used to think. In fact, certain species of fish can even remember events from as long as 12 days ago.

    In the study, researchers from MacEwan University in Canada trained a kind of fish called African cichlids to go to a certain area of their tank to get food. They then waited for 12 days before putting them back in the tank again.

    Researchers used computer software to monitor the fish's movements. They found that after such a long break the fish still went to the same place where they first got food. This suggested that they could remember their past experiences.

    In fact, scientists had been thinking for a long time that African cichlids might have a good memory. An earlier study showed that they behaved aggressively（挑衅地） in front of certain fish, perhaps because they remembered their past “fights”. But until the latest findings, there was no clear evidence.

    Just as a good memory can make our lives easier, it also plays an important part when a fish is trying to survive in the wild.

    “If fish are able to remember that a certain area contains safe food, they will be able to go back to that area without putting their lives at risks,” lead researcher Trevor Hamilton told Live Science.

    For a long time, fish were placed far below chimpanzees, dolphins and mice on the list of smart animals. But this study has given scientists a new understanding of their intelligence.

    We're surrounded by chemistry in everyday life. Sometimes it is easy to see, like when your science teacher conducts a big experiment in class. At other times, it can be extremely hard to see everyday chemistry at work, but nearly everything you touch or use has some element of chemistry in it.

    Something as simple as toothpaste contains at least three chemicals, if not more. It is the mixture of them and its chemical reaction that keeps your teeth clean. Other things you use every day are created by chemistry, such as hair products, shampoo and soap. Adding detergent (洗涤剂) to water involves chemistry. Without chemistry, we would never have realized that we need soap to get the oil out of clothes or skin.

    Chemistry not only helps us make products for use, but it also helps us understand the world around us. Chemistry helps us understand what the ozone layer (臭氧层) is and how it protects us. Chemistry also gives us sunscreen to protect us from the sun. Thanks to chemistry, we know bleach (漂白剂) can't be mixed with vinegar, because it can produce poisonous gas. Without chemistry, we wouldn't have had fireworks displays on important days like the Spring Festival.

    Chemistry plays a big role in food preparation. Cooking food causes it to go through a chemical change. That is why cooked food often tastes different from raw (生的) food. Baking is a great example of chemistry. Too much or too little of any ingredient makes a difference to the result of baking, for example, the dough (面团) won't rise or the cake will be flat.

    Chemistry isn't something that just lives in a lab; it's something that you come across hundreds of times every day. If you know how chemistry works, you will get a greater comprehension of the science behind some of the simplest looking things.

The next time you attend a social function or go to a place where people meet and interact, take note of the number of people who have adopted the same gestures and posture—the way you sit or stand--of the person with whom they are talking. This "carbon copying" is a means by which one person tells the other that he is in agreement with his ideas and attitudes. By this method, one is non-verbally (非语言的) saying to the other, "As you can see, I think the same as you, so I will copy your posture and gesture."

    This unconscious (无意识地) mimicry is quite interesting to observe. Take, for example, the two men standing at the hotel bar. They have mirrored each other's gestures and it is reasonable to assume that they are discussing a topic upon which they have the same thoughts and feelings. If one man uncrosses his arms and legs or stands on the other foot, the other will follow. If one puts his hand in his pocket the other will copy and this mimicry will continue for as long as the two men are in agreement.

    This copying also occurs among good friends or people of the same social position and it is common to see married couples walk, stand, sit and move in very similar ways. People who are strangers, however, try hard to avoid holding mutual(相互的) positions. The significance of carbon copying can be one of the most important non-verbal lessons we can learn, for this is one way that others tell us that they agree with us or like us. It is also a way for us to tell others that we like them, by simply copying their gestures.

    If an employer wishes to develop immediate friendliness and create a relaxing atmosphere with an employee, he needs to copy the employee's posture to achieve the end. Similarly, an up-and-coming employee may be seen copying his boss's gestures in an attempt to show agreement. Using the knowledge, it is possible to influence a face-to-face encounter by copying the positive gestures and postures of the other person. This has the effect of putting the other person in a receptive and relaxed frame of mind and he can "see" that you understand his point of view.

    Why are people interested in eating raw foods or whole foods? One reason is that eating these types of food reduces the risk of acid accumulation in your body.

    Raw and whole foods are usually digested more efficiently than cooked and refined foods. When we cook foods, we destroy the natural enzymes (酶) that are part of the food in its raw form. These enzymes were intended by nature to help us digest the food. When we consume food without these natural enzymes, our bodies either digest the food improperly or allow too many nutrients to be absorbed into the bloodstream. In both instances, the result is obesity. When too many nutrients are absorbed at once, the body grows fat. Improperly digested food moves slowly through the digestive tract, where it becomes increasingly acidic. To protect its vital organs from this acidic waste, the body changes the acid into fat and stores it safely away from the organs.

    Processed foods contain chemical elements, which might confuse the appetite mechanism that tells us when we've had enough to eat; as a result, people often overeat. Processed foods also upset the digestive cycle. The body will either identify these foods as allergens and then store them safely away from the organs as fat, or the remains of undigested food will become acidic and enter the bloodstream as acid waste, which will stick to the blood vessel walls and block the passage of vital oxygen and nutrients heading for the body's cells. The body's metabolism (新陈代谢) becomes inactive, and the result is weight gain and obesity.

    The accumulation of acid in the digestive tract makes digestion increasingly inefficient. When that happens, even healthy foods can become acidic and the food allergies will become more common.

    To stop this vicious circle in its tracks, people need to consume food and supplements that will neutralize the acid already accumulated in body. Eating the right types of raw and whole foods can help. It's also important to restore your enzyme balance. You need to identify and avoid the foods that cause acid accumulation and consume the foods that increase enzyme production. If you truly want to change and help your body heal itself, you need to take an active approach.

The San Francisco Bay Area is one of the most diverse places in America, a wonderful place filled with people from all backgrounds. Each of them drew something different from their own experience. Their stories are the focus of Status Update, an exhibition of 14 projects offered by Dundon and former WIRED contributor Pete Brook. The show at SOMarts uses personal tales to show the Bay Area's culture. 

The Bay Area is a microcosm (缩影) of the national melting pot, a place where people of color comprise 58 percent of the overall population and are a majority in four of the region's five countries, San Francisco in particular is the type of place where you can' t walk down the street without hearing another language. Yet the change is not all for the better. The gap between rich and poor is widening at a frightening speed, and San Francisco is becoming less diverse as minorities escape from the city for more affordable communities elsewhere in the region. 

Status Update reflects these changes and the challenges they bring. Joseph Rodriguez's Faces of Foreclosure features quiet images of people like Ethel Gist, who lost her home in the East Bay suburb of Brentwood six years ago. Photographer Sam records Oakland resident Shannon and his efforts to provide for his daughter. And Laura Morton documents millennials (千禧一代 )hoping to make their way to the top in Silicon Valley in her series Wild West Tech. 

Status Update starts a conversation about how the Bay Area is changing, and what people can do to build up a more just equitable (公正的) society. "I hope people walk away from this show with a little more respect for our neighbors and communities and the ways we depend on one another." Dundon says. "we're all out here together"