D

On May 18, 1969, NASA astronauts Thomas Stafford, John Young, and Eugene Cernan boarded the Apollo 10 lunar module(登月舱)—the fourth manned mission in the US Apollo Space program and only the second after Apollo 8 to circle the moon. Its mission was to circle the moon and thoroughly test the components and procedures to pave the way for the first lunar landing. The mission went perfectly without incident—at least that's what every one believed.

    However, that view has changed since February 22, after NASA released a digital recording of strange music heard by the space travelers. Then as they were re-entering the zone where they could communicate with ground control. One of the astronauts asked if they should report it. In response, Stafford expressed his doubts if anyone would even believe them. But they needn't have worried. When NASA experts listened to the recordings, they thought the strange sounds were radio interference.

Michael Collins—the Apollo 11 pilot—said that the only reason why he was not shocked upon hearing them was that he had been forewarned by NASA officials. Collins also said that the music stopped as soon as the lunar module landed on the moon.

    So why did it take NASA over 40 years to release the digital recording of the awful music only after it was featured in a recent television series NASA's Unexplained Files? The US Space Agency says they have not been hiding them. In the press release that accompanies the release of the recording, NASA officials state, “The Apollo 10 audio clips were uploaded in 2012, but the mission's sound recordings have been available at the National Archives for anyone that wanted to hear them since the early 1970s.”

    Eugene Cernan. Apollo 10's pilot who heard the sounds first, also released a statement saying, “I don't remember that incident excited me enough to take it seriously. It was probably just radio interference. Had we thought it was something other than that, we would have briefed everyone after the flight. We never gave it another thought.”

While most people are ready to accept this logical explanation, there are some that believe otherwise. They guess the music proves the presence of aliens. Among them is Apollo 15 astronaut Al Worden, who thinks the sounds came from a source in outer space. In the episode of NASA's Unexplained Files, which discusses the origin of the strange music, the astronaut says, “Logic tells me that if there was something recorded on there, then there was something there.”

    There's a new frontier in 3D printing that's beginning to come into focus: food. Recent development has made possible machines that print, cook, and serve foods on a mass scale. And the industry isn't stopping there.

     Food production

    With a 3D printer, a cook can print complicated chocolate sculptures and beautiful pieces for decoration on a wedding cake. Not everybody can do that — it takes years of experience, but a printer makes it easy. A restaurant in Spain uses a Foodini to "re-create forms and pieces" of food that are "exactly the same," freeing cooks to complete other tasks. In another restaurant, all of the dishes and desserts it serves are 3D-printed, rather than farm to table.

    Sustainability(可持续性)

    The global population is expected to grow to 9.6 billion by 2050, and some analysts estimate that food production will need to be raised by 50 percent to maintain current levels. Sustainability is becoming a necessity. 3D food printing could probably contribute to the solution. Some experts believe printers could use hydrocolloids (水解胶体) from plentiful renewables like algae(藻类) and grass to replace the familiar ingredients(烹饪原料). 3D printing can reduce fuel use and emissions. Grocery stores of the future might stock "food" that lasts years on end, freeing up shelf space and reducing transportation and storage requirements.

    Nutrition

    Future 3D food printers could make processed food healthier. Hod Lipson, a professor at Columbia University, said, "Food printing could allow consumers to print food with customized nutritional content, like vitamins. So instead of eating a piece of yesterday's bread from the supermarket, you'd eat something baked just for you on demand."

    Challenges

    Despite recent advancements in 3D food printing, the industry has many challenges to overcome. Currently, most ingredients must be changed to a paste(糊状物) before a printer can use them, and the printing process is quite time-consuming, because ingredients interact with each other in very complex ways. On top of that, most of the 3D food printers now are restricted to dry ingredients, because meat and milk products may easily go bad. Some experts are skeptical about 3D food printers, believing they are better suited for fast food restaurants than homes and high-end restaurants.

    From American Express, wedding guests will, on average, spend $673 on each wedding they attend this year. It includes airfare （$225）, hotel （$170）, dining out （$116）and dressing up （$95）and the gift. If you have weddings to attend this year, here are some tips for you to avoid breaking the bank.

    ⒈Book flights in advance

    The moment you decide to attend a wedding is the time to check flight prices at the best time. Plane fares are higher in the summer, especially in July and August. Booking in advance will save you money, as will watch for sales on lower﹣cost carriers like JetBlue and Frontier. You can check Google Flights for a calendar of prices showing the cheapest days to fly from apps like Hopper to get real﹣time alerts when a fare is at its lowest price point.

    ⒉Don't blow your budget on the gift

    If you've got the money, an expensive gift is lovely. But there's no need to take out loans to prove your love for the happy couple. Skip an expensive necklace by giving （an appropriate amount of） cash instead. To save on the gift, consider making one： A photo album or scrapbook of memories with the bride and groom shows how much you care. You could also share the gift with other guest(s) or even make gifts with DIY ideas by yourself to save money.

    ⒊Use old dresses and suits

    You don't always have to be on a new dress for a wedding. While men have the option of repeating their suits, women are more likely to spend money on new clothes for the special occasion. But before you take out your wallet, consider reinventing something already in your closet. Belts, colorful scarves, shoes can bring life to any outfit.

    Application Workshop

    Join Citizens Committee for New York City and the NYC Department of Sanitation for a workshop on the Green Team Mini-Grant application on February 2, which lasts from 4:00 PM to 5:30 PM!

    The workshop will cover

    Applying for the Green Team Mini-Grant

    How to use the Zero Waste schools website

    Creative Coding

    We are hosting a free design workshop just for girls on March 7 from 4:30 PM to 6:00 PM, in support of International Women's Day! The focus of the workshop is on Creative Coding, with art and technology, but we'll also have a few female designers to share their unique work with the attendees.

    No experience necessary, this event is for girls between the ages of 9-12.

SAT & ACT Roadmap to Success

    In this free 1-hour workshop, parents will discover the road map to SAT & ACT success. Topics included: Review of "goal scores" for SAT/ACT college admissions, national trends in college admissions, how to determine whether the SAT or the ACT is the best test for your student, steps to prepare for the Sat or ACT, best time to take the Sat or ACT. Join us on March 23.

    Square School Family Information Night

    Join us for our Family Information Night on March 14! We'll gather at the future home for Square School for an introduction to the school model at 6:30pm.

    This event is intended for families with young people entering grades six or seven in 2019 that want to be a part of a school community that attaches importance to a lifestyle of learning. Join us for this Family Information Night to see if Square School is the right choice for your family.

    In the shadow of Kenya's Mount Kilimanjaro, nine Rothschild giraffes, the rarest giraffes on the planet, are free to wander at the English-style manor (庄园). Every day shortly before 9am, they come up to the house and stick their heads through the windows and doors in search of morning treats. The manor's owners, Tanya and Mikey Carr-Hartley, share their dining table with them. And now the couple are sharing the fantastic experience with the public by opening the manor gates to guests at the giraffe hotel, the only hotel of its kind in the world. Now, guests can feed the giraffes at breakfast but can also get up close to them from their second-floor bedrooms.

    Mr and Mrs Carr-Hartley, both 38, spent their childhood living close to the house in Nairobi and have always been enthusiastic about the animals. Tanya said, "Mikey and I grew up near this manor house when we were children. We are both third generation Kenyans and have always wanted to work in conservation. Mikey's family have been related to the protection of animals for many generations. His granddad helped the removal of giraffes as far back as the 1930s because the Rothschild giraffes lost much of their natural living space. When the house came up for sale, we jumped at the chance to buy it as we had always dreamed of owning it. Now, we were absolutely overjoyed to do something for the giraffe protection. Having the giraffes so close is very special and something which people can now experience by staying in one of the ten rooms at the hotel."

    A conservation project to save them was started at the manor in 1974 by the previous owners. "The previous owners ran a very successful breeding (繁殖) programme, where many giraffes were set free into the wild and we hope to continue," said Tanya.

    Most heroes are not super. They don't appear in comic books, on television, or in movies. They just do what they believe needs to be done to make their world a better place. Bike Batman is one of them.

    Bike Batman is a 30-year-old married engineer who lives in Seattle, Washington. He's a cyclist who also buys and sells bikes as a hobby.

    About three years ago, he was looking for a bike for his wife. He found one on Craigslist, a website where people list things they want to sell. As he often does, he also looked at Bike Index, a popular website that allows users to register their bikes and post reports when they're taken. The bike, which he was considering purchasing, clearly matched one reported stolen on Bike Index. Then he called the person who claimed to be the bike's owner and arranged to meet him-- supposedly to complete the sale. When the two men met, Bike Batman told the thief, "You've got two options. You can wait until a police officer gets here, or you can just get out of here." You can imagine what the thief did.

    After that first success, Bike Batman developed a safer routine. When he sees questionable bike ads on Craigslist, he cross-references the image with bikes reported on Bike Index. Once he has confirmed it with the owner, he arranges a meet-up with the thief and will call the Seattle police department so that officers can participate in the action. In more than half of the 22 cases in which he has got back and returned bikes, the thieves have been arrested. In one case, Bike Batman even helped a family recover a wide range of prized possessions that suspects had stolen during a home burglary.

    His nickname came from a discussion with a police officer who suggested he be called "Robin Hood". Since he wasn't exactly stealing from the rich and giving to the poor, "Batman" seemed a better fit. The idea of a superhero punishing criminals feels pretty silly to him, but the main reason he continues his work is to keep up Seattle's reputation as a friendly city.