TOKYO—Lonely astronauts on the International Space Station (ISS) may soon be getting a robot friend from Japan.

    Japan's space agency is considering putting a talking humanoid(有人的特点的) robot on the ISS to watch the work while astronauts are asleep, monitor their health and stress levels and communicate to Earth through the micro­blogging site Twitter.

    Japan's space agency JAXA announced this week that it is looking at a plan to send a humanoid robot to the space station in 2013 that could communicate with the ground through Twitter—primarily feeding photos, rather than original ideas —and provide astronauts with “comfort and companionship”．

    Following up on US NASA's “Robonaut” R­2 program, which is set for launch on the Discovery shuttle next week, the Japanese robot would be part of a larger effort to create and refine robots that can be used by the elderly, JAXA said in a statement.

    Japan is one of the leading countries in robotics and has a rapidly aging society with one of the world's longest life expectancies.

    Improving robot communication capabilities could help elderly people on Earth by providing a nonintrusive(无干扰的) means of monitoring the robot owner's health and vital signs and sending information to emergency responders if there is an abnormality, JAXA said.

    “We are thinking in terms of a very human­like robot that would have facial expressions and be able to talk with the astronauts，” said JAXA's Satoshi Sano.

    The robot was being developed with the advertising and communications giant Dentsu Inc and a team at Tokyo University.

    The NASA project has a human­like head, hands and arms and uses the same tools as station crew members. The “Robonaut” called R­2 is intended to carry out maintenance tasks in the station's Destiny lab.

    NASA says it hopes that humanoid robots could one day stand in for astronauts during spacewalks or perform tasks too difficult or dangerous for humans.

    For now, the $2.5 million NASA robot is limited to activities within the lab.

    Soft winds blew throughout the Windy City today. We welcomed the winds, as it was another hot day in Chicago. The wind blew, bringing us some coolness—and making the weather not that hot. But it was a beautiful summer day with a blue sky.

Chicago is a great city for eating, and we have enjoyed tasting the different foods. Last night, we tried one of the city's most famous foods: deep-dish pizza. Chicago claims credit for the rich and cheesy thick-crust pizza, covered with a sweet tomato sauce. We topped it with olives and green peppers.

       We were touring the city, mainly looking for delicious local foods. Today, we enjoyed a Polish specialty at lunch: Pierogis, an Eastern European dumpling-like dish, filled with foods like potatoes, cheese, mushrooms, cabbage and meat. Polish immigrants started settling in Chicago in the 1850s, and the city has one of the largest Polish communities in the U.S.

    We took a break from exploring the city to talk with some of you! Ashley and Caty logged onto the Internet for an on-the -road version of TALK2US. We spoke to an English teacher in Tokyo, Japan, and a graduate student in India.

Meanwhile, Adam searched for some locations around the city to shoot some video. He chose a spectacular spot: Navy Pier, Chicago's most-visited attraction. The winds from Lake Michigan keep visitors cool, and the view of the Chicago skyline never fails to impress. In fact, the view made all of us head over heels!

    Our time in Chicago has come to an end. Tomorrow, the true journey begins, as we pass through Illinois and into Missouri via Route 66. Springfield, the home of Abe Lincoln, and St. Louis, the “gateway to the West,” wait for us.

    The pillage (掠夺) and destruction of ancient shipwrecks and sunken archaeological sites by treasure hunters seeking gold and other valuables may be illegal under the terms of an international treaty under discussion by UNESCO's 188 Member States.

    "Protecting our underwater heritage is extremely important and increasingly urgent as no site or shipwreck is now out of bounds for treasure hunters. New technologies have made deep-water wrecks easily accessible and these technologies are getting cheaper," warns Lyndel Prott.

    According to estimates by commercial salvors (寻宝者), there are some three million undiscovered shipwrecks scattered across the world's oceans. Even the figures for the known wrecks are impressive. The Northern Shipwrecks Database for example contains 65,000 ship loss records for North America alone from 1500 AD to the present. The Dictionary of Disasters at Sea by Charles Hocking (1969) lists 12,542 sailing ships and war vessels lost between 1824 and 1962.

    Then there are sunken cities such as the trading town and pirate stronghold(海盗堡垒) of Port Royal in Jamaica, which disappeared beneath the waves after an earthquake in 1692. Or the remnants of ancient civilisations, such as the Lighthouse of Alexandria in Egypt, and the Neolithic villages being discovered under the Black Sea, which some believe could help explain Noah's great flood.

    These treasures of cultural heritage are under serious threat. Technology now allows extraordinary access to the ocean depths for determined and well-financed treasure hunters. And the potential rewards are huge. In 1985, American salvor Mel Fisher discovered the wreck of the Señora de Atocha, a Spanish ship that sank off the Florida Keys in 1622 with her cargo of gold, silver and jewellery worth an estimated US $400 million.

    An archaeologist can spend ten years or more studying a ship, conserving its objects and publishing its findings. We gain an enormous amount of information and knowledge from this work. With treasure hunters, all of this is lost. This is tragic, for humanity as a whole.

    Have you ever been to Taiwan, China's biggest island? Do you want to pay a visit there? We'll show you the best of Taiwan is land.

Concrete has served as the foundation stone of the construction industry for hundreds of years. However, the process of producing concrete is one of the most environmentally unfriendly processes in the world. In the process, not only is carbon dioxide（二氧化碳）released into the air by the energy used to heat the limestone, but the limestone itself also gives out a huge amount of the element. 

Luckily, a number of start-ups throughout the world are using creative thinking to make the construction industry a whole lot more friendly for the planet. 

A Canadian company called CarbonCure, has found a way to inject（注入）concrete with carbon dioxide itself. Not only does this trap the carbon dioxide into the concrete, keeping it from running away into the atmosphere, but it also creates a super strong material called calcium carbonate, which reduces the total amount of concrete that needs to be used. 

California-based Brimstone, is creating carbon-negative concrete by doing away with limestone entirely and instead using silicate rock, a material that does not release carbon dioxide when heated. Instead, the process produces magnesium（镁）, which absorbs carbon dioxide, as the basis for their concrete. 

Additionally, researchers at Australia's RMIT University have recently released a study showing that adding coffee grounds instead of sand to concrete could make it much stronger, reducing both the amount of sand used, as well as the amount of concrete that would need to be used in the final product. 

The biggest barrier at this point is convincing members of the industry that the new types of concrete are safe to be used, according to Stacy Smedley, director at a nonprofit focused on decarbonizing construction. 

Hopefully these new solutions to the environmental problems of concrete will soon be widely adopted. Given the significant part the construction industry has in releasing carbon dioxide into the atmosphere, great improvements can be made when more environmentally-friendly materials are used. 

Barrington Irving made his historic flight and founded an educational non-profit-making organization.The secret,he believes,is having a dream in the first place,and that starts with learning experiences that inspire kids to build careers.

The moment of inspiration for Irving came in his parents' bookstore.One customer,a professional pilot,asked Irving if he'd thought about becoming a pilot."I told him I didn't think I was smart enough;but the next day he took me to the cockpit(驾驶舱)of the commercial airplane he flew,and just like that I was hooked."

To follow his dream,Irving turned down a football scholarship to the University of Florida.He washed airplanes to earn money and increased his flying skills by practising at home on a $40 flight simulator(模拟) video game.Then another dream took hold:flying alone around the world.He faced more than 50 rejections for sponsorship before convincing some companies to donate aircraft components.He took off with no weather radar,no de-icing system(除冰系统),and just $30 in his pocket.

After 97 days,26 stops and dozens of thunderstorms,he touched down to a cheering crowd in Miami."It was seeing so many young people watching and listening that pushed me into giving back with my knowledge and experience." Irving has been doing it ever since.He set up his non-profit-making organization,Experience Aviation(航空),aiming to increase the numbers of youth in aviation and science-related careers."We want to create chances for students to accomplish something amazing,"he notes.The most powerful educational tool is the example his own life provides.