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.

    The English language has many ways to talk about something that is funny. {#blank#}1{#/blank#} It is a basic human need. Physical humour, especially, can cross limits like nationality and language and bring people together from all different walks of life.

    Humour comes in many forms. The most obvious and traditional way we use humour is in jokes. {#blank#}2{#/blank#} This is when a person changes a word or uses it in a different context(上下文) for comic effect.

    Another way people can use humour is through telling a funny story. Perhaps something bad happened to the person but they can laugh about it now. People also invent funny stories in order to make people laugh. The advantage of this is that the characters aren't real. {#blank#}3{#/blank#} 

    Physical comedy usually divides opinions. For some, seeing someone fall down, whether it is planned or not, is one of the funniest things they can see. {#blank#}4{#/blank#} Some types of humour can also be harmful if someone is not in the mood for being made fun of！People's senses of humour vary across the world, so what may be funny in your country might be incredibly harmful in another!

    {#blank#}5{#/blank#} The British, for instance, are famous for their humour in English. However, people learning a foreign language face much difficulty when it comes to being funny in a second language.

A. Humour is just one of the ways.

B. Everyone needs to laugh once in a while.

C. Other forms of humour are word play and puns(双关语).

D. Therefore, you don't have to feel bad for laughing at them!

E. People of all ages and cultures have a strong sense of humour.

F. Most people know how to use some form of humour in their native languages.

G.For others, finding physical humour and non-serious accidents funny seems cruel.

    Self-driving vehicles will rely on cameras, sensors and artificial intelligence (AI) to recognize and respond to road and traffic conditions, but sensing is the most effective for objects and movement in the neighborhood of the vehicle. Not everything important in a car's environment will be caught by the vehicle's camera. Another vehicle approaching at high speed on a collision (碰撞) track might not be visible until it's too late. This is why vehicle-to-vehicle communication is undergoing rapid development. Our research shows that cars will need to be able to chat and cooperate on the road, although the technical challenges are considerable.

    Applications for vehicle- to-vehicle communication range from vehicles driving together in a row, to safety messages about nearby emergency vehicles. Vehicles could alert each other to avoid collisions or share notices about passers-by and bicycles.

    From as far as several hundred meters away, vehicles could exchange messages with one another or receive information from roadside units (RSUs) about nearby incidents or dangerous road conditions through 4G network. A high level of AI seems required for such vehicles, not only to self-drive from A to B, but also to react intelligently to messages received. Vehicles will need to plan, reason, strategize and adapt in the light of information received in real time and to carry out cooperative behaviors. For example, a group of autonomous vehicles might avoid a route together because of potential risks, or a vehicle could decide to drop someone off earlier due to messages received, a foreseen crowding ahead.

    Further applications of vehicle- to-vehicle communication are still being researched, including how to perform cooperative behavior.

    I was just in France to visit my grandmother who is very dear to me. I don't get to cross the Atlantic very often, and she's now 96 years old, so every time I visit her, the two of us are very aware that it might be the last time we see each other.

    Last year, I did a series of short video interviews about her life. I asked her what it was like growing up with her father in the 1910s, and living alone with two young children. I asked her about her greatest memories, and her favorite books, foods, etc. I learned a lot of amazing new things about her I had never known before. These were very intimate conversations, which made me know her better.

    This year, I did not really have questions and I only had a great desire to make her know how much I loved her. I cooked for her and read her stories. I gave her a foot massage (按摩), which was her first ever! Before leaving, I was looking for a way to leave something meaningful behind besides the memory of our time together. Therefore, I wrote her five different love notes, and hid them in different places where I knew she would eventually find them.

    I left really joyously knowing that these cards would surely cheer her up after I left. She called me as I was travelling back to Paris to catch my plane back to the US and said, “I found your cards! By the time I discovered the last one, I was laughing out loud! Thank you so much, my sweetheart!” I smiled to myself, knowing she still had two more to go! It was Sunday, so my guess was that she had not checked her mailbox and had not yet driven her car!

    Patients with light or moderate depression can be successfully treated by swimming with dolphins, researchers said on Saturday.

    The study was carried out in Honduras, including patients who were thought by the doctors with light of moderate depression coming from the United States and Honduras.

    For two weeks, half of the group swam and snorkeled (潜泳) with dolphins for an hour a day. At the same time the other half group carried out the same type of water activities, but with the absence of dolphins. Researchers want to find out the influence of water and the natural setting.

    All the study volunteers didn't continue to take any drugs or psychotherapy ( 心理治疗) at least for weeks before the start of the study and did not take any drugs during the study, said the researchers from the division of clinical Psychiatry at t e the University of Leicester Medical School.

    By the end of the study, those people who swam with the dolphins had a greater average reduction in their depressive symptoms than those who did not.

    The researchers noted that the study supports the theory of biophilia, which thinks that human health and well-being depends partly on the human connection with the natural world. The findings appeared in the issue of the British Medical Journal.

    Coming from the Greek, biophilia means “love of life”, and it has been developed by biologists to reflect the humans' natural tendency to connect with nature and animals, leading to interactions and positive emotions that result in psychological treatment.

    We all carry fear, and accepting the type of fear you carry is the first step in punishing past it. So, here's a breakdown of the fear archetypes(典型) and how to make them work for you. We also invited Dr. Alicia Hodge to give us her feedback in a few of them.

    The procrastinator(拖延症患者)

    The procrastinators often obsess(痴迷于) over the outcome of whatever they're doing and insist on it being perfect. Because of this, they tend to spend too much time planning and researching instead of simply diving in.

    For procrastinators, it's important to push past that fear of starting. Hodge suggests setting a deadline for when your planning and researching period will end and when you'll actually get started.

    The people pleaser

    Those who have the people-pleaser archetype struggle with the fear of being judged and worry most about disappointing others. They have a hard time setting clear boundaries and saying "no."

    "Having boundaries often sounds scary to someone who is used to putting others first" Hodge says. "Remind yourself that you deserve to be prioritized, just as much as other people in your life."

    The self-doubter

    This archetype is dominated by the fear of not being good enough, those who self-doubt tend to feel not confident about their capabilities.

    A good way to overcome self-doubt is to step outside your comfort zone every once in a while – and take note of the outcome. Practice being proactive about your life, you'll be surprised to see just how much you are capable of.