Their cheery song brightens many a winter's day. But robins are in danger of wearing themselves out by singing too much. Robins are singing all night一as well as during the day, British-based researchers say.

    David Dominoni, of Glasgow University, said that light from street lamps, takeaway signs and homes is affecting the birds' biological clocks, leading to them being wide awake when they should be asleep.

    Dr Dominoni, who is putting cameras inside nesting boxes to track sleeping patterns, said lack of sleep could put the birds' health at risk. His study shows that when robins are exposed to light at night in the lab, it leads to some genes being active at the wrong time of day. And the more birds are exposed to light, the more active they are at night.

    He told people at a conference, "There have been a couple of studies suggesting they are increasing their song output at night and during the day they are still singing. Singing is a costly behaviour and it takes energy. So by increasing their song output, there might be some costs of energy."

    And it is not just robins that are being kept awake by artificial light. Blackbirds and seagulls are also being more nocturnal. Dr Dominoni said, "In Glasgow where I live, gulls are a serious problem. I have people coming to me saying `You are the bird expert. Can you help us kill these gulls?'.During the breeding(繁殖)season, between April and June, they are very active at night and very noisy and people can't sleep."

    Although Dr Dominoni has only studied light pollution, other research concluded that robins living in noisy cities have started to sing at night to make themselves heard over loud noise.

    However, some birds thrive(兴旺)in noisy environments. A study from California Polytechnic University found more hummingbirds in areas with heavy industrial machinery. It is thought that they are capitalising on their predators(天敌)fleeing to quieter areas.

    As a gesture of friendship，Mayor Yukio Ozaki of Tokyo，Japan gave Washington, D.C a gift of more than 3,000 Japanese cherry trees on March 17,1912.Every spring, the cherry trees in Washington，D.C. take bloom(开花)，beginning one of the country's loveliest celebrations, the National Cherry Blossom Festival (March 17-April 15). Book your trip now to see this vibrant display of pink and white in this city full of history!

    Washington, D.C. Cherry Blossom In-Depth Tour

    Priee: $45/person

    Available: Mar.25-Apr.15

    Duration: 1 Day

    Highlights: Visit Washington， D.C.; experience the peak period of cherry blossom(April 8-12)

    Itinerary: Guests will start to celebrate the National Cherry Blossom Festival and discover the beauty of cherry blossoms. Next,we will begin our sightseeing city tour including Lincoln Memorial, White House, US Capitol, Madame Tussauds Wax Museum, Washington Monument and International Spy Museum. Then visit the next tourist spot, the Jefferson Memorial. It's the best location to view the cherry blossoms. Finally, guests may board a Potomac River cruise to see the city from the water. Then tour ends.

    Price Includes: Ground Transportation

    Admission Fees:

    Note: If you would like to join in the optional activities, please pay the fee in cash to the tour guide. You cannot buy the tickets on your own or use City Pass. The tour guide will arrange the tickets for the group.

    Five years ago, when I taught art at a school in Seattle, I used Tinkertoys as a test at the beginning of a term to find out something about my students. I put a small set of Tinkertoys in front of each student, and said: "Make something out of the Tinkertoys. You have 45 minutes today — and 45 minutes each day for the rest of the week."

    A few students hesitated to start. They waited to see the rest of the class would do. Several others checked the instructions and made something according to one of the model plans provided. Another group built something out of their own imaginations.

    Once I had a boy who worked experimentally with Tinkertoys in his free time. His constructions filled a shelf in the art classroom and a good part of his bedroom at home. I was delighted at the presence of such a student. Here was an exceptionally creative mind at work. His presence meant that I had an unexpected teaching assistant in class whose creativity would infect(感染) other students.

    Encouraging this kind of thinking has a downside. I ran the risk of losing those students who had a different style of thinking. Without fail one would declare, "But I'm just not creative."

    "Do you dream at night when you're asleep?"

    "Oh, sure."

    "So tell me one of your most interesting dreams." The student would tell something wildly imaginative. Flying in the sky or in a time machine or growing three heads. "That's pretty creative. Who does that for you?"

    "Nobody. I do it."

    "Really-at night, when you're asleep?"

    "Sure."

    "Try doing it in the daytime, in class, okay?"

    Google's new camera, called Clips, is a small, smart device. It comes with a case that has a clip (夹子), but it's not designed to be worn on your clothing. Most interestingly, it uses artificial intelligence to take photography out of your hands so it can capture moments on its own.

    This roughly 2-inch by 2-inch camera, with a three-hour battery life and Gorilla Glass for toughness, is intended for candid moments, like when a child does something cute that may happen too quickly for you to pull out your smartphone.

    Onboard the Clips device, it uses machine learning algorithms (计算程序) to help capture scenes. Those algorithms include face recognition. "Once it learns that there's a face you see frequently, it'll try to get nice photos of those faces," said Juston Payne, the device's product manager. And they also want it to recognize facial expressions, which involved "training it to know what happiness looks like". The Google team also trained it to recognize what not to shoot—like when a child's hand is over the lens, or if it is tossed in a dark purse.

    The only way to see the images is by connecting the camera with your phone, as it has no screen for viewing or editing.

    Were people concerned it could seem strange? Yes, Payne admitted. But they said they addressed that by making it obvious what it is. A green light on the front signals that it is on. Besides, unlike a camera meant to monitor your home, it is not connected to the Internet.

    "This product is only possible because of the way that silicon has advanced" Payne said, noting that it was only in the past year or so that they could squeeze the technology down into a device this size. Going forward, we're likely to get more assistance from the artificial intelligence packed into our apps and gadgets.

After months of expectation and secrecy, the official mascot (吉祥物) of the 2022 Winter Olympic Games－a giant panda-inspired cartoon character－made its first public debut with cheers at Beijing's Shougang Ice Hockey Arena.

The panda is named “Bing Dwen Dwen” in Chinese. Bing means “ice” in Chinese, while Dwen Dwen suggests “health and cleverness”－characteristics also shared by pandas. Pandas are perhaps the most recognized animal species in China, organizers said.

“Pandas combine China's traditional culture and its modern appearance together with winter sports elements in a fascinating image (形象) that shows our great expectations for the Games and shows that we welcome the world,” said Beijing Mayor Chen Jining, who also serves as an executive president on the organizing committee.

“I have already seen the mascot and from what I've seen, it's a wonderful choice,” IOC President Thomas Bach said before introducing the character.” “The mascot really takes in the best elements and characteristics of China and the Chinese people. It will be a great ambassador (大使) for the country and the 24th Winter Olympics.”

The ring of light surrounding the mascot's face is suggestive of ice and snow tracks, as well as the flowing “ribbons” of the National Speed Skating Oval. The oval is one of two new competition sites in downtown Beijing expected to become a landmark of the Games, according to its chief designer Cao Xue.

The introduction of the mascots marks the key point of a journey that began in August 2018, when Beijing organizers started a global design competition for the mascots. A total of 5,816 designs were received from 35 countries, and were reviewed by Chinese and international experts in a comprehensive evaluation and selection process.

The new mascot will serve as spirited symbol of the Games that will take place in the three zones of downtown Beijing, the suburban district of Yanqing and co-host city Zhangjiakou in surrounding Hebei province.

Pleasanton Partnerships in Education Foundation (PPIE) was started in 1987 to raise money by organizing running events for local schools. Based in Pleasanton, California, a suburb of San Francisco, the non-profit organization recently hosted a family-focused fitness event for the community. "Our event helps to bring the community together," said Mindy Louie, events and outreach manager for PPIE. "We have more than 3,000 participants, hard-working volunteers and viewers."

This year's fitness event took place on April 30 at the Alameda County Fairgrounds. It featured races of two miles, five kilometers and ten kilometers. A new Kids Challenge consisted of a quarter-mile run to encourage younger children to participate. When asked to describe the run, 11-year-old Jeremy Louie said, "Fun, exciting and enjoyable." Jeremy added that he was happy to help support his school.

PPIE supports all 15 schools in the Pleasanton Unified School District, which include more than 14, 500 students and 800 teachers and staff. The nonprofit organization tries to fund programs affected by budget cuts, while encouraging fitness and athleticism. To date, the PPIE has raised over $1 million for the school district.

A local runners' group called the BURN Youth Development (B. Y. D.) participated in the fundraising. The B.Y.D. has since grown to more than 100 youth members, 30 of whom ran in April's PPIE event. Jerry Wu, the group's founder and lead coach, explained that the B.Y.D. was born to keep kids running. "Watching them running strongly and happily makes me smile every time," Jerry said.

Jerry encourages teamwork and teaches the students valuable running techniques. As a B.Y.D. member, Ollie Gu, an eighth grader, was one of the top finishers in the ten-kilometer run. He completed the race in 40 minutes and 46 seconds and won first place in the 12-to-15 year-old age group. "The race was extremely rewarding," Ollie said. "I'm looking forward to it next year."