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”.

    Toronto is reminding citizens this month what exactly can and can't go into the blue bins an you may be surprised at what can't be recycled. As it turns out the takeout coffee cups you've been throwing into the recycling actually have to go in the garbage.

    The city's “recycle right” web explains that food left after a meal, woven (编织的) cloth, old VHS tapes and other things have been turning up in blue bins, where they don't belong.

    According to the city, about 45,000 tunes of garbage was mistakenly put into recycling bins last year alone.

    Among those things are the takeout coffee and tea cups we get while were on the go. The city says that because those paper cups are lined with plastic or wax they can't be recycled. The black plastic coffee lids (盖子) also can't go in the blue bin, although non-black plastic lids can be recycled.

    Emily Alfred, senior campaigner with the Toronto Environmental Alliance, said, “Millions of cups are used in Toronto every year and people are taking these out and putting them in the wrong bin.”

    When paper coffee cups are thrown in with the recycling. Alfred said, they produce a harmful effect on the system.

    “They can't separate the plastic and paper in a typical paper recycling center,” Alfred said, “so it just causes pollution of the recycling process, and it causes lower-quality paper if it does get recycled.”

    “New regulations passed last month call for changes to be rolled out over the next few years regarding what products companies can sell,” Alfred said. Her organization will be pushing for more producer responsibility laws, which call on companies that design and make products to take on the responsibility of recycling them.

    For now, consumers can consider carrying their own reusable coffee cups while they are on the go, ask for a ceramic mug (陶瓷杯) if they plan to consume their drink in the cafe, and support their local government officials if they have put efforts into changing recycling or producer responsibility laws.

    Alfred said, “I think people can change their habits easily if they understand what to do.”

    My folks bought their first house in the early 1940s after Dad got a better job in Marquette, Michigan. We lived just inside the city limits in what was still a rural area.

    In the spring of 1948, when I was 6 years old, my parents bought a calf（小牛）to replace our cow, which had been killed the year before. So one day we drove to a local farm and returned with a white and brown calf we named Tubby.

    We didn't own a truck, so Tubby rode home in the backseat of Dad's car with my 9-year-old brother, Steve, and me. As you can imagine, the trip was a lot of fun for us kids.

    Later that summer, Mom thought it would be cute to take a picture of me sitting on Tubby's back. All went well until the snap of the camera shutter sent Tubby charging off on a run, with me holding on for dear life.

    I lasted for about 30 feet before I hit the ground. Mom was quick enough to shoot a follow-up picture, so we had photos of me both on and off Tubby!

    When summer had passed, the day arrived for poor Tubby to fill our freezer. I must have been somewhere else with my Mom on the fateful day, because I have no memory of how it happened. All I knew was that the barn was empty, and that we had plenty of meat for dinners.

    I hadn't lived on a farm like my mother, so I didn't understand that what happened to Tubby was not unusual. Livestock aren't meant to be pets, and most farm kids know and accept that truth.

    Whenever we had beef for dinner, I would tearfully, “Is this Tubby?” This went on for a couple of weeks until Dad had finally had enough and declared, “No more cows!” That made me feel a little better about poor Tubby.

    Claude Monet, Pablo Picasso and Leonardo da Vinci ... the art world has never lacked talent. And now, a new painter is ready to join the list although this one isn't even human.

    Next month, auction house Christie's Prints and Multiples will make history by offering the first piece of art created by artificial intelligence (AI) for sale. The painting is a portrait of a man called Edmond De Bela- my, and is expected to be sold for up to $10,000.

    The work, which features a man with a mysterious look on his face, was created by software developed by the French art group Obvious. Laugero-Lasserre, an art collector, called the work "grotesque and amazing at the same time". This isn't the first example of Al-produced artwork, as AI has already been used to write poems and compose .songs. However, many people doubt whether it should be called art at all.

According to Russian writer Leo Tolstroy (1828 -1910), art is about creating emotion (情感). It's "a means of …joining people together in the same feelings' he once said.

So, if the emotion behind art is what makes it, the ability to create and use tools is what makes human Icings different from other species. And as a tool itself, the AI technology used to create the portrait is the result of a lot of effort made by several designers. Together, they "fed" the AI a huge collection of paintings from the 14th to the 18th centuries, until it was able to work out how to make similar paintings of its own.

    The introduction of AI art could be the beginning of a new artistic movement. However, not everyone is ready to welcome these high-tech artists just yet.

    "The human mind is what's behind the AI technology. And the human mind is not a cold, hard fact," said Oscar Schwartz, a professor of AI. "Rather, it in something that's created with our opinions and something that changes over

    An experimental cleanup device called RemoveDEBRIS has successfully cast a net around a dummy (仿真的) satellite, imitating a technique that could one day collect spaceborne garbage.

    The test, which was carried out this week, is widely believed to be the first successful demonstration of space cleanup technology, experts told CNN. And it symbolizes an early step toward solving what has already been a critical issue: junk in space.

    Millions of pieces of junk are turning around in orbit the result of 50 years of space travel and few regulations to keep space clean. At orbital speeds, even a small bit of paint crashing with a satellite can cause critical damage.

    Various companies have plans to send thousands of new satellites into low-Earth orbit, already the most crowded area.

    The RemoveDEBRIS experiment is run by a company and researchers led by the U. K.'s Surrey Space Center and includes Airbus, Airbus-owned Surrey Satellite Technology Ltd. and France's ArianeGroup.

    Guglielmo Aglietti, the director of Surrey Space Center, said that an operational version of the RemoveDEBRlS technology would cast a net that remains fastened to the main satellite so the debris can be dragged out of orbit. It could target large pieces of junk, including dead satellites up to 10 meters long.

    The RemoveDEBRIS satellite will conduct a few more experiments in the coming months, including testing navigation features that could help guide the satellite to a specific piece of debris.

Jonathan McDowell, an astrophysicist at the Harvard-Smithsonian Center for Astrophysics, said the success of this week's experiment was exciting, but he cautioned against "over- publicizing" it.

    There are still enormous barriers to clear before operational cleanup tasks are underway, he said, and the most discouraging is figuring out how to fund such projects.

    Aglietti, the Surrey professor who helped lead the RemoveDEBRIS project, said "The challenge will lie in persuading the relevant authorities to sponsor these tasks." Aglietti said he hopes RemoveDEBRIS will conduct a few cleanup tasks per year, targeting the largest pieces of junk in the most crowded orbits.

Public libraries are an excellent resource for research, literacy(读写能力)education, and reading-centered events. Most towns have one or share library services with other towns through a mobile library, and the use of a public library is free to people who are willing to apply for a library card.

There are several primary sources of library funding(资金)， starting with national funds which are distributed to states or provinces. These regions send the funds on to public libraries. Local governments also play an important role in providing funding for libraries, and most librarians apply for grants(拨款). Finally, private donations help to maintain libraries—most libraries have an association of Friends of the Library which organizes fund-raising sales and pays annual dues to help maintain the library.

Grants and private donations can also be used to provide a large amount of funding for public libraries, and some large libraries maintain a separate staff to increase the amount of funding that they can obtain through these sources. Grants include technology grants which allow libraries to install and upgrade computer systems, grants which focus on a particular topic such as science, fiction, children's books, or local history, and education grants which support locally-based community efforts such as after-school reading programs. Many private donors are pleased to support their local public libraries by donating funds or including some library in their wills, and libraries reward their donors with treats like after-hours visits or privileged access to special collections.

By combining multiple resources, creative librarians can keep their libraries useful, informative, and fun for browsers. When it comes to supporting public libraries, every little bit counts: if you cannot afford to donate to a local library, think about volunteering time to help shelve, lead after-school programs, or organize fund raisers. Being active with your public library is a very important way to contribute to your local community.