In 1905, as part of his Special Theory of Relativity, Albert Einstein published the point that a large amount of energy could be released from a small amount of matter. This was expressed by equation E = me 2(energy = mass times the speed of light squared). But bombs were not what Einstein had in mind when he published this equation.

    In 1929, he publicly declared that if a war broke out he would “refused to do war service, direct or indirect…” His position would change in 1933, as the result of Adolf Hitler's coming into power in Germany.

    Einstein's greatest role in the invention of the atomic bomb was signing a letter to President Franklin Roosevelt urging that the bomb be built because some physicists feared that Germany might be working on an atomic bomb. Among those concerned were physicists Leo Szilard and Eugene Wigner. But Szilard and Wigner had no influence with those in power. So in July 1939 they explained the problem to someone who did: Albert Einstein. After talking with Einstein, in August 1939 Szilard wrote a letter to President Roosevelt with Einstein's signature on it, which was delivered to Roosevelt in October 1939.

    Germany has invaded Poland the previous month; the time was ripe for action. That October research of a-bomb began but proceeded slowly because the invention of the atomic bomb seemed distant and unlikely. In April 1940 an Einstein letter, ghost-written by Szilard, pressed the researchers on the need for “greater speed”.

    As the realization of nuclear weapons grew near, Einstein looked beyond the current war to future problems that such weapons could bring. He wrote to his friend about his fear about the future use of the a-bomb.

    The atomic bombings of Japan occurred three months after Germany gave in.

In November 1954, five months before his death, Einstein summarized his feelings about his role in the creation of the atomic bomb: “I made one great mistake in my life… when I signed a letter to President Roosevelt recommending that atom bombs be made; but there was some justification— the danger that the Germans would make them”.

    Energy independence. It has a nice ring to it. Doesn't it? If you think so, you're not alone, because energy independence has been the dream of American president for decades, and never more so than in the past few years, when the most recent oil price shock has been partly responsible for kicking off the great recession.

    “Energy independence” and its rhetorical (修辞的) companion “energy security” are, however, slippery concepts that are rarely though through. What is it we want independence from, exactly?

    Most people would probably say that they want to be independent from imported oil. But there are reasons that we buy all that oil from elsewhere.

    The first reason is that we need it to keep our economy running. Yes, there is a trickle（涓涓细流）of biofuel available, and more may become available, but most biofuels cause economic waste and environmental destruction.

    Second, Americans have basically decided that they don't really want to produce all their own oil. They value the environmental quality they preserve over their oil imports from abroad. Vast areas of the United States are off-limits(禁止) to oil exploration and production in the name of environmental protection. To what extent are Americans really willing to endure the environmental impacts of domestic energy production in order to cut back imports?

    Third, there are benefits to trade. It allows for economic efficiency, and when we buy things from places that have lower production costs than we do, we benefit. And although you don't read about this much, the United States is also a large exporter of oil products, selling about 2 million barrels of petroleum products per day to about 90 countries.

    There is no question that the United States imports a great deal of energy and, in fact, relies on that steady flow to maintain its economy. When that flow is interrupted, we feel the pain in short supplies and higher prices, At the same time, we derive(得到，获得) massive economic benefits when we buy the most affordable energy on the world market and when we engage in energy trade around the world.

    A member of our class told us of a request made by his wife. She and a group of other women in her church were involved in a self-improvement program. She asked her husband to help her by listing six things he believed she could do to help her become a better wife. He reported to the class," I was surprised by such a request. Frankly, it would have been easy for me to list six things I would like to change about her—my heavens, she could have listed a thousand things she would like to change about me—but I didn't. I said to her, 'Let me think about it and give you an answer in the morning.'”

    “The next morning I got up very early and called the florist (花商) and had him send six red roses to my wife with a note saying, 'I can't think of six things I would like to change about you. I love you the way you are.”

    “When I arrived at home that evening, who do you think greeted me at the door? That's right. My wife! She was almost in tears. Needless to say, I was extremely glad I had not criticized her as she had requested. ”

    “The following Sunday at church, after she had reported the results of her assignment, several women with whom she had been studying came up to me and said, 'That is the most considerate thing I have ever heard.' It was then that I realized the power of appreciation.”

    Lincoln once began a letter saying, “Everybody likes a compliment (赞扬).” William James said, “The deepest principle in human nature is the desire to be appreciated.” So, let's give honest, sincere appreciation to others instead of criticizing them. This will make a great difference to your life as well as others' life.

    Amazing concept images have shown what homes of the future could look like, as preparations are made for the world's first free from 3D-printed property (房产).

    Experts will build a house called Curve Appeal, which will be 3D-printed off-site before being put together on-site to create two outside walls, a roof and an inside part. These four main sections will then be joined together.

    Although 3D-printed buildings have been made before, this home - to be constructed in Chattanooga, Tennessee, later this year — will be the first of its kind, as it will contain no regular shapes or angles. The house is the creation of the design company WATG, based in London and California. The design for Curve Appeal draws inspiration from the Case Study House program.

    The architects leading the program were famed for constantly pushing the limits in terms of minimalist (极简主义) materials, and trying to create open-plan spaces that focused on enhancing (增强) natural light. In a written statement, a spokesman for WATG said, “Employing many of the same modem design principles, Curve Appeal is the next evolutionary step. It's important that the architecture and the environment work together harmoniously. The chosen site is steps away from the Tennessee River in a beautiful wooded, sunlit area.”

    WATG was awarded the first prize in the Freeform Home Design Challenge in 2016 and given prize money of $ 8,000 to make its plans a reality. The competition was aimed at architects, designers, engineers and artists. Participants were challenged to design a 600 to 800sq ft single-family home that rethinks traditional aesthetics (美学), ergonomics, construction, building systems and structure.

    Over the last year, WATG's Chicago office has been developing their design with Branch Technology. This project is currently underway, working towards breaking ground later this year. Once completed, the Curve Appeal home will have open and light-filled inside living spaces.

    Have you ever trained your brain? Now there are some new suggestions, such as eating dark chocolate and having cold meat for breakfast. You should also avoid watching soap operas, spending time with people who complain or follow fat-free diets, according to a new book on getting “brain-fit”.

    Many of the suggestions in Teach Yourself Training Your Brain are surprising. The book says to read out loud while holding a baby. Writers Terry Horne and Simon Wotton say their advice is from the latest research by experts around the world.

    “For years we have thought our brain capability is decided by our genes. But it's now clear that it depends on our lifestyle. What we eat and drink, how we learn at school and what type of feelings we have are all important,” said Horne.

    The book talks about the most up-to -date thinking in science about how diet, the environment, stress and other sides of modern life affect our brain capacity. It also offers advice and exercises. The book comes as more and more people are spending money on books, DVDs and computer games, which can improve their brain's capability.

    Horne believes that people need to make changes to their lifestyles to increase their brain capacity. Happiness, confidence and an optimistic nature help the brain, he added.

    “So mix with people who make you laugh, or share the same interests as you. And avoid people who complain,” said Horne. “People who are negative will make you sad, which means you won't achieve things.”

    Ever walked to the shops only to find, once there, you've completely forgotten what you went for? Or struggled to remember the name of an old friend? For years we've accepted that a forgetful brain is as much a part of aging as wrinkles and gray hair. But now a new book suggests that we've got it all wrong.

    According to The Secret Life of the Grown-up Brain, by science writer Barbara Strauch, when it comes to the important things, our brains actually get better with age. In fact, she argues that some studies have found that our brain hits its peak between our 40s and 60s — much later than previously thought.

    Furthermore, rather than losing many brain cells as we age, we keep them, and even produce new ones well into middle age. For years it's been assumed that brain, much like the body, declines with age. But the longest, largest study into what happens to people as they age suggests otherwise.

    This continuing research has followed 6,000 people since 1956, testing them every seven years. It has found that on average, participants performed better on cognitive (认知的) tests in their 40s and 50s than they had done in their 20s. Specifically, older people did better on tests of vocabulary, verbal memory (how many words you can remember) and problem solving. Where they performed less well was number ability and perceptual speed — how fast you can push a button when ordered. However, with more complex tasks such as problem-solving and language, we are at our best at middle age and beyond. In short, researchers are now coming up with scientific proof that we do get wiser with age.

    Neuroscientists are also finding that we are happier with aging. A recent US study found older people were much better at controlling and balancing their emotions. It is thought that when we're younger we need to focus more on the negative aspects of life in order to learn about the possible dangers in the world, but as we get older we've learned our lessons and are aware that we have less time left in life: therefore, it becomes more important for us to be happy.