【推荐1】The city of San Francisco is a wonderful tourist attraction that offers many different things to see and do. The best way for a traveler to get a good look at the city is to take one of the many different tours there.

Tour the City on Foot

When touring the city by walking, you aren’t going to walk much. What’s more, there are far more benefits. This kind of tour allows you to see as many buildings of the city as possible. A tour of the city on foot usually focuses on a more localized neighborhood level, which can be very interesting in a number of different ways.

Hit the Waters of San Francisco Bay

The Waters of San Francisco Bay have played an important role in the city’s development over the last century, Touring San Francisco from the water is a completely unique way for you to see this wonderful city.

Take a Bus Tour

If you want to see a wide variety of attractions from all over the city, one of the best things you could do is to book a tour through our company that offers services here. A bus tour of San Francisco is one of the most complete ways to experience the city

Tour San Francisco From the Air

While it is one of the most expensive ways to see San Francisco, touring the city from the air is one of the most unique and thrilling ways to see the city. Seeing the city from high above allows you to get a full view of the city as tour guides point out attractions from high above. If you do decide to tour San Francisco by air, you’ll be creating memories that you won’t forget forever.

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【推荐2】It’s never too late to earn your college degree. Just ask 94-year-old Hazel Soares.

The woman was one of about 500 students to pick up diplomas (学位证书) at Mills College. “It’s taken me quite a long time because I’ve had a busy life,” said Soares. “I’m finally achieving it, and it makes me feel really good.”

Soares, who has six children and 40 grandchildren and great-grandchildren, is believed to be the world’s second oldest person to graduate from college. Born in Richmond, Calif. in 1915, Soares said she had wanted to attend college right after she graduated from Roosevelt High School in 1932, but that was during the Great Depression. “Unless you had some help, it would have been impossible to go to college,” Soares said. “However I never lost the desire to go.”

Soares married twice, raised six children and worked as a nurse before she retired. After retiring, she decided to return to try to achieve her dream of earning a college education.

She spent six years taking courses before earning her associate’s degree when she was 85. Then she enrolled at Mills College in 2007.

“We are really amazed and very proud of my mom,” said Regina Hungerford, Soares’ youngest child. “The biggest thing that we can all learn is that we’re never too old to do something.” Soares doesn’t plan to relax now that she finally has her degree. The art history major hopes to work as a guide at a museum.

Soares said she doesn’t know the source of her longevity (长寿). No one in her family has lived as long as she has — but she believes it has something to do with eating lots of fresh vegetables.

She hopes others realize that it’s never too late to get a college education. “There’s no reason why you could not go back,” Soares said. “Some people say it’s too late or that there is   much work. They may not realize that once you try it, it’s exciting to go to school.”

【推荐3】It doesn’t matter when or how much a person sleeps, but everyone needs some rest to stay alive. That’s what all doctors thought, until they heard about Al Herpin. Al Herpin, it was said, never slept. Could this be true ? The doctors decided to see this strange man themselves.

Al Herpin was 90 years old when the doctors came to his home in New Jersey. They thought for sure that he got some sleep of some kind. So they stayed with him and watched every movement he made. But they were surprised. Though they watched him hour after hour and day after day. They never saw Herpin sleeping. In fact, he did not even own a bed. He never needed one.

The only rest that Herpin sometimes got was sitting in a comfortable chair and reading newspapers. The doctors were puzzled by this strange continuous sleeplessness. They found only one answer that might explain his condition. Herpin remembered some talk about his mother having been injured several days before he was born. But that was all. Was this the real reason ? No one could be sure. Herpin died at the age of 94.

【推荐1】We have some practically secret national parks on our lists that you'll want to visit this spring.

The most visually striking point here is El Capitan. The massive cliff (悬崖), 2.5 times as tall as the Empire State Building, towers over the rest of the park, which offers you a perfect spot for taking impressive pictures. You can also wander the Salt Basin Dunes, 2,000 acres of shockingly white sands. If you're taking very long hikes, bring plenty of water and some protein-rich snacks.

The Katahdin Woods and Waters National Monument preserves more than 87,500 acres of wild rivers and thick forests. In addition to hiking and camping, Katahdin is a great spot for hunting and fishing. Bring some hiking boots and perhaps trekking poles (登山杖)to cross these rocky forest trails. The park has a day use fee of $5, and the first-come, first-serve campsites cost $8 per night.

Though the snowy peaks of the North Cascades are dangerous in the winter, it turns into a thick and green park in the warmer months, filled with beautiful mountain valleys and clear lakes. You can take a guided nature hike or go fishing. Winter driving conditions in the North Cascades can be dangerous, due to water, frost, snow, or ice on the roads.

This is not a national park，but is a national monument. It is home to several rare species of plants and animals，and lava (炫岩)flow. There are excellent chances for hiking, mountain biking, rock climbing, and nature photography, as well as overnight hiking. You can also go primitive camping anywhere in the monument for free. It's highly recommended that you should bring plenty of water and sunscreen, and know your fitness level ahead of time.

【推荐2】Book Your Field Trip to Pacific Science Center

A field trip to Pacific Science Center is a time-honored tradition for students of all ages across Washington State. Our hands-on exhibits, shows, and creative programs inspire students’ curiosity for science in a day of exploration meant to strengthen your curriculum and fuel lifelong enthusiasm for science, math, engineering and technology.

To schedule your field trip, complete the registration request form available at the link www.pacificsciencecenter.org/field-tripsl/, or call (206) 443-2925 Monday — Friday from 8:30 a.m. to 4:30 p.m. not less than two weeks ahead of your visit date. We will contact you within two business days to set up your field trip.

Starting September 3, 2019 PacSci will be closed on Mondays and Tuesdays except for holidays and weeks during Seattle Public School breaks. We will no longer be booking field trips on those days, as well.

One free adult general admission is covered for every 10 paid students. Free adult admission doesn’t include IMAX documentary. These adults will be charged a $4 IMAX documentary admission. Additional adults outside of the ratio (比例) will be charged the student admission rate. Pacific Science Center Memberships cannot be applied to field trips. Payment is due one week before you visit.

■ Planetarium Shows

■ IMAX Documentaries

■ Science on a Sphere Shows

■ Laser Shows

【推荐3】The United States space agency will send a spacecraft to explore the sun more closely than ever before on Saturday. NASA'S Parker Solar Probe（探测器）will fly through the hot solar atmosphere and come within just 6 million kilometers of the sun's surface.

The Parker Probe will get almost seven times closer to the sun than earlier spacecraft. To do this, it will fly past Venus（金星）seven times over seven years. Each pass will change the probe's orbit by providing a gravity push. It will move ever closer to the sun and straight into the corona（日冕）, the sun's outermost atmosphere.

By exploring the sun's corona, scientists hope to learn why it is hundreds of times hotter than the sun's surface. They will also study what drives the solar wind.

The project was proposed in 1958, the same year NASA was established. Now, "it's becoming a reality," said project manager Andy Driesman.

The Parker spacecraft has a 2.4 meter heat shield（护罩）that is 11 centimeters thick. It is made of two carbon sheets. The front has a white coating to reflect sunlight. It is expected to shine red when it experiences the extreme solar heat. Almost everything on the spacecraft will be behind this shield to keep its scientific instruments relatively cool.

Besides, the spacecraft will also be traveling at a high speed. The probe will reach 690,000 kilometers per hour in the corona. The spacecraft will make its first flight past Venus in early October. Its first pass by the sun is expected in November.

The Parker Solar Probe is the first NASA spacecraft to be named after someone who is still alive. Eugene Parker is a 91-year-old professor at the University of Chicago. He predicted the existence of solar wind 60 years ago. He plans to be at Cape Canaveral Air Force Station in the southern state of Florida to see the launch.

【推荐1】Marie, an 85-year-old woman who had been bedridden (卧床不起的) for 10 years, was granted her biggest wish to look at the sea again with help from East Coast Radio and Netcare 911.

About 10 years ago, Marie had an unsuccessful back operation which left her bedridden. She then had to stay in an old age home and needed constant care. “The only time she could go outside was when she was taken to hospital over the years,” said Lucy, Marie’s daughter.

Lucy wrote an e-mail to East Coast Radio in April asking them to help her take her mother to the beach because it was her biggest wish. She told them that her mother just wanted to go and look at the sea and go back again to the home, that’s all. East Coast Radio did an interview with the family and agreed to make her wish come true.

Two weeks later, a team of Netcare 911 paramedics (医护人员) fetched Marie from the old age home and took her in a stretcher to Amanzimtoti Beach. One of the paramedics found a bucket and collected some sea water for her to put her hands in. She also got a chance to touch the sand.

Marie said, “Thanks to these kind people, I could get to the beach again, which may be the last time for me.”

【推荐2】Imagine that you’ve got a robot that looks like a human, talks like a human, and even interacts like a human. Although you know it’s just a machine, you can relate to it. But would you consider it as a friend?

This is just one of the questions that you may find difficult to answer. Sooner or later artificial intelligence (AI) will bring many moral challenges. But AI is here to stay and will have a big impact on our future. As Li Fei-Fei, professor of computer science at Stanford University put it, “If our era is the next industrial revolution, as many claim, AI is surely one of its major driving forces.”

Merriam-Webster defines AI as “the capability of a machine to copy intelligent human behavior”. But what makes us want to create “thinking machines”? After all, thinking and consciousness are inimitable things of human beings – at least at present. They separate us from all other creatures on Earth.

For one thing, humans constantly desire to develop new technology just because they can. The desire to create AI is the ultimate expression of this: We want to test the limit of human intelligence by building a brand new intelligence. For another, AI has all sorts of practical benefits to offer us. It would free us from repetitive work and make our lives easier. Imagine getting to your destination with an AI-guided self-driving car. Imagine having an AI tutor that could help you with your homework.

However, as AI becomes more important in life the worries will begin. Will AI effectively start to take over us? Today, with online shopping sites and social networking platforms, AI already influences many of our choices. Algorithms (算法) determine the content we see on the Internet, and make recommendations about everything from what we watch on TV to where we travel. Some fear that machines will become better at making decisions than humans are, and that therefore we will lose our control of AI.

But it’s not all doom and gloom(前景黯淡). Max Tegmark, author of Life 3.0: Being Human in the Age of Artificial Intelligence, believes that with careful planning, AI can become a powerful tool. “I’m optimistic that we can create an inspiring future with AI if we win the race between the growing power of AI and the growing wisdom with which we manage it,” he told Motherboard.

But like it or not, AI is shaping the society and will dramatically change the way we live.

【推荐3】Nearly each country in the world has its official honors reserved (保留) for outstanding people. For instance, in the United State, the highest civilian honor is the Presidential Medal of Freedom. In China, there are also such official honors given to people who have made outstanding contributions (贡献)to the nation's construction and development.

On Sept. 17, 2019, President Xi Jinping signed a presidential decree (主席法令) to award 42 individuals the Medal of the Republic, the Friendship Medal and various honorary titles.

Shen Jilan, an 89 year old farmer, is one of the eight people who were awarded the Medal of the Republic. She is the only person in China who has served at all 13 National People's Congresses (人民代表大会) since 1954. She is the very witness to the development of the People's Congress system. It was she who put forward the clause on “equal pay for equal work” between men and women, which was written into the first Constitution of PRC in 1954.

Tu Youyou, who had received the Nobel Medicine Prize in 2015，was also awarded the Medal of the Republic. She is famous for finding outQinghaosu, which has helped to save millions of lives. Before the discovery, malaria is a deadly disease to people of tropical developing countries in South Asia, Africa and South America. Therefore, her discoveryof Qinghaosuand its treatment of this disease is considered as an important breakthrough in the 20th century.

Yuan Longping, the father of hybrid rice (杂交水稻), received the Medal of the Republic as well. He is known for his great contributions to hybrid rice research and the wonderful work he has done to improve rice production in many developing countries. Judging from his appearance, he looks like a farmer rather than a scientist, with his sunburnt face and slim, strong body. That is because he always works under the sun for a long time and that is how he developed hybrid rice which produces 1/3 more than normal rice.

Ye Peijian who has been devoted to China's lunar program for twenty years, received the honorary title “the people's scientist”. He is well-known as a leading scientist in deep-space exploration at the China Academy of Space Technology.