1 . One of the three astronauts who made up the historic Apollo 11 crew, NASA veteran Michael Collins passed away today, April 28, 2021, at the age of 90.

Collins was born on Oet. 31, 1930, in Rome, Italy. His father, a career officer in the US, Amy who’d go on to retire as a major general, was stationed there at the time. After his family returned stateside, Collins earned a Bachelor of Science degree from the US. Military Academy at West Point, graduating with the class of 1952. He then became an Air Force test pilot, which opened some interesting doors. In 1962, John Glenn became the first American to orbit the Earth. Glenn’s achievement was an inspiration for Collins. “I certainly had no childhood dream of flying to the moon or anywhere else, but the idea was extremely appealing.” Collins wrote in his autobiography Carrying the Fire: An Astronaut’s Journeys. He was selected to join NASA’s third class of astronauts the following year. His first extraterrestrial (地球外的) adventure came in 1966, when Collins set about on a three-day spaceflight with fellow astronaut John Young. Known as Gemini X, their mission was one for the record books; the two men reached the then-unprecedented (前所未有的) altitude of 475 miles (764kilometers ).

Of course, Michael Collins is best remembered for his role in Apollo 11. On July 16, 1969, at 8:32 AM ( Eastern Standard Time ), Collins, Buzz Aldrin and Neil Armstrong were launched out of the Kennedy Space Center in Florida. They were the three explorers NASA had chosen for the first mission that would ever put a man on the moon. Four days into their adventure, on July 20, Collins parted ways with his crewmates. Seated in the Eagle landing craft, Armstrong and Aldrin made their landing onto the lunar surface. An American flag was planted; photos were taken; Armstrong said the immortal words, “ One small step for man, one giant leap for mankind. ”

Meanwhile, Collins stayed behind in the crew’s command module (舱), orbiting the moon as his colleagues explored it.

2 . For centuries people have wondered who was the model for Leonard do da Vinci’s Mona Lisa and what was the reason for her smile. But the Mona Lisa is just one of the many mysteries in the art world. Here are some other notable unsolved art mysteries that might be a little less familiar.

Mystery 1: Who Is the girl in Johannes Vermeer’s Girl with a Pearl Earring?

Around 1665, Dutch artist Johannes Vermeer painted a charming portrait of a young girl. People around the globe have long wondered who this fetching young lady was. Many say she must have been Vermeer’s daughter or girlfriend. Others think she wasn’t a real person, but rather an intentionally mysterious, timeless figure. The painting, referred to as the “ Mona Lisa of the North ” , has been part of The Hague’s permanent collection since 1903. But it draws record-breaking crowds whenever and wherever it tours around the world.

Mystery 2: Where Is Raphael’s Portrait of a Young Man?

Portrait of a Young Man is considered one of the most important pieces of art to go missing during World War II. The painting was created around 1513 by Raphael, a famous Italian Renaissance artist, and stolen from Poland’s Princes Czartoryski Museum in 1939.

The portrait had traveled to Germany and Austria before it was gone in 1945.

Mystery 3: Was Van Gogh Murdered?

One of the main things people know about Vincent van Gogh is that he cut off his ear. That was likely because the Dutch post-impressionist painter suffered from mental illness, probably severe depression. The official cause is suicide from a gun shot at close range.

That certainly seems plausible (貌似有理的), given his poor mental health. However, no gun was found near his body, and locals reported two teenage boys bullying him shortly before his death.

3 . The Science and Technology Facilities Council (STFC) and University of Central Lanca-shire (UCLan) share findings of a project to improve student engagement with science, technology, engineering and mathematics (STEM).

It’s long been acknowledged that students from disadvantaged backgrounds are under-represented in science, technology, engineering and mathematics careers. Now, research conducted by UCLan and funded by STFC shows the causes of this problem and points to innovative solutions. The Blackpool Physics; Inspire, Engage, Research (PIER) project found that primary school children from low socio-economic areas are just as interested in science but lack knowledge about possible science careers.

The PIER project is following a group of pupils as they progress from Grade 6 to Grade 9, using surveys, interviews and other assessments to measure interest in science. These initial findings suggest that attempts to increase science participation among young people should not simply promote the subject as “fun” or “interesting”. Instead, greater impact could be achieved by demonstrating clearly how science can open possible future career opportunities.

Many of the pupils taking part in the study understood that studying science could be useful but few could explain why, suggesting a need for greater education about STEM careers. As well as broadening our understanding of the issue, the PIER project is solving the problem head on. The team has carried out a variety of activities each year for the participants, including “meet the scientists” events, trips to UCLan’s Alston Observatory as well as family science events at school.

Lead Researcher and STFC Fellow in Public Engagement, Professor Robert Walsh, said, “Much government policy towards boosting science in higher education focuses on an assumed lack of interest and desire in low-socioeconomic groups.” However, the enthusiasm is already there and this “hidden science identity” needs to be revealed and translated into real-life prospects for these young people. We’re recommending that programs instead allow young people to explore their science identity more fully and provide innovative ways to discover the jobs that studying science may lead to.

4 . Margot doesn’t have a garbage can. It doesn’t need one because Margot simply doesn’t cause anything to get thrown away. The restaurant doesn’t allow any type of single use plastic. Margot, which opened last year, is one of the small but growing restaurants around the world aiming to avoid not only food leftovers, but also any garbage.

“Food waste has been increasing as an issue for restaurants over the last 10 years,” says Calvin Brown. He runs the Sustainable Restaurant Association. Based in the United Kingdom, the organization helps food business become more environmentally responsible. He says that food waste contributes to releasing the greenhouse gas, so there is strong motivation to reduce waste and help the environment.

In the USA, food waste and packing account for nearly half of the material sent to landfills. Restaurants from McDonald’s to Starbucks are addressing this issue with “no straw Mondays” and limits on single-serving plastic, but a handful of restaurateurs are trying to get rid of rubbish entirely. There’s also economic case to be made for waste reduction. One study shows that restaurants save seven dollars for every dollar invested in anti- waste methods.

Avoiding food waste is the first and perhaps most obvious challenge for sustainable restaurants. Doug McMaster, chef at Silo in London, only serves a set menu. This removes the worry that one particular item won’t sell well, and will spoil in the refrigerator. Compost (堆肥) is a necessity as well. Nolla (meaning “zero” in Finnish) in Helsinki, Finland is giving compost to its suppliers as well as its diners. Nolla also has food- tracking software more commonly used among corporate food service companies to keep track of what sells and what rots.

Sometimes restaurants call themselves environmentally friendly, but they might just be using the label. Calvin offers some pointers on what to look for to make sure a restaurant is truly committed to sustainability.

6 . This year, people around the world are lining up to buy electric vehicles even as prices increase. Electric vehicle, EV, demand has stayed strong even as the average cost of lithiumion (锂离子) battery cells increased to an estimated $160 per kilowatt-hour in the first quarter from $105 last year. Costs rose due to supply issues, restrictions on Russian metals and investor speculation (投机).

For a smaller vehicle like the Hongguang Mini, the best-selling EV in China, the higher battery costs added almost $1,500, equal to 30 percent of the listed price. But gasoline and diesel fuel costs have also increased since the conflict between Russia and Ukraine, and experts noted that environmental concerns are also pushing more buyers to choose EVs.

Manufacturers from Tesla to SAIC-GM-Wuling, which makes the Hongguang Mini, have passed higher costs on to consumers with price increases for EVs. More may be coming. Andy Palmer, chairman of Slovak EV battery maker InoBat, said, “rising costs will have to be passed onto carmakers.” But EV shoppers have so far not slowed down. Worldwide EV sales in the first quarter jumped nearly 120 percent, said the website EV-volumes.com.

Venkat Srinivasan is director of the Center for Collaborative Energy Storage Science at the U.S. government’s Argonne National Laboratory in Chicago. He said, “more and more people would buy EVs despite the cost of the battery and the vehicle.”

This increase in battery costs could be an unusual short-term change in a situation in which improving technology and growing production have pushed costs down for almost 30 years. Industry data showed that the $105 per kilowatt hour average cost in 2021 was down nearly 99 percent from over $7,500 in 1991.

Experts say battery costs could stay high for the next year or so, but then another large drop is likely as big investments by automakers and suppliers change the balance from shortage to surplus. “It’s like a bubble (泡沫) and for that bubble to settle down, it’s going to be at least the end of 2023,” said Prabhakar Patil, a former LG Chem executive.

The industry has long been awaiting the battery cell cost of $100 per kilowatt-hour, as a signal EVs were reaching a similar cost to fossil-fuel vehicles. But with gasoline prices high and consumer preferences changing, such cost considerations may no longer matter as much, experts say.

7 . You may have recently seen a video from the Beijing Wildlife Zoo becoming a hit. What exactly was so interesting about this video? It shows a dog playing with big cats four to five times its size! Many people might wonder if this dog has a death wish, but it seems that the dog and the big cats are good friends.

The dog was actually raised alongside the lion and tiger cubs, making up an odd but loving family, according to zoo officials. As opposed to the common belief, cross-species friendship has been around for centuries. People have domesticated many animals, most notably cats and dogs, and formed bonds with them as pets. Perhaps you even have a pet yourself.

There are many other instances of cross-species friendships.

At an animal sanctuary in Santiago, Chile, a jaguar named Marina and a deer named Laura formed a friendship after they both came to the park. As neither animal had a mother, sanctuary staff said they instantly bonded when they met. Laura had been rescued from a slaughterhouse while Marina had been rescued from the street.

One possible explanation for these friendships is the environment of the zoo. Animals don’t hunt for their food and don’t need to worry about marking their territory or looking for mates in the way an animal in the wild would. “All those activities take time and energy, and if these needs are removed, the animals get bored,” Gordon Burghardt, a psychologist at the University of Tenessee, US, told The Atlantic magazine. “In this particular situation, the animal’s motivation to engage socially and playfully may be higher in its need hierarchy(等级)than eating.”

Marc Bekoff, former biology professor at the University of Colorado, US, told Slate magazine, “I think the choices animals make in cross-species relationships are the same as they’d make in same-species relationships. Some dogs don’t like every other dog. Animals are very selective about the other individuals who they let into their lives.”

9 . Do you want to see majestic lions roaring, rare rhinos running and colorful birds flying? You’ll find this incredible display of nature in the Kenya Lake System in the Great Rift Valley.

First stop

Fly into Nairobi, the capital of Kenya. This great city is known for its fashion markets and beautiful art. And be sure to pick up some rich Kenyan coffee while you’re there! Then head for the countryside.

Plan your trip

The largest of the three lakes in the system, Lake Nakuru, is less than 175 kilometers from Nairobi. But Lakes Bogoria and Elementaita are equally worth a visit. You can stay at one of several choices of luxurious cabins in the valley. And if you sign up for a trip, be sure to put flamingos, the white and pink birds, at the top of your list.

Paradise

The Kenya Lake System is shallow and alkaline (碱性的). That means it supports vegetation such as green algae, a food source for many waterfowl. Hundreds of species of birds flourish here, using this area as a major breeding and nesting ground. Water buffalo, leopards, monkeys and the endangered Rothschild giraffe also make this area their home.

Other sights

Wildlife isn’t the only natural wonder in the Great Rift Valley. The valley marks a place where the earth is divided far below the surface. This rock separation below ground leads to noticeable features above ground. Walking around Lake Bogoria especially, you will see steam rising from hot springs.

Other activities include golfing, horseback riding and hiking. The fun doesn’t stop when the sun goes down, either. The river valley is far from city lights, so many visitors gaze at the stars shining above.

If you are ready for a wildlife experience, don’t hesitate!

10 . Humans have been living and working on the space station for 20 years. Their meals are packaged, though sometimes astronauts receive fresh treats from resupply missions. The longer that packaged food is stored, the more it loses nutrients like vitamin C and vitamin K.

Astronauts have successfully grown 10 different crops on the space station since 2015 and had the chance to sample each one. The International Space Station hosted a party for astronauts on Friday as they celebrated the harvest of the first Chili (辣椒) grown in space. The crew finally had a chance to taste the peppers after initially kicking off the plant experiment on the space station in July.

Plant Habitat-04 is one of the most complex plant experiments on the orbiting laboratory to date because peppers take much longer to grow than the previous experiment plants. After growing for four months, the peppers were harvested on Friday.

Peppers provide a great source of vitamin C, as well as other key nutrients. Pepper plants self-pollinate, so they are easy to grow, and they are a pick-and-eat crop that doesn’t have to be cooked. They are also safe to eat raw.

A side effect of life in zero gravity is that astronauts often lose some of their taste and smell, so spicy or well-seasoned foods are a favorite. Adding fresh greens or peppers to the menu allows astronauts to liven up their regular meals. But growing and tending to the plants can also produce other benefits.

Astronauts have described the joy from seeing—as well as smelling and caring for—leafy green plants on the space station that remind them of Earth.

“Growing colorful vegetables in space can have long-term benefits for physical and psychological health,” said Matt Romeyn, principal investigator for the experiment.” We are discovering that growing plants and vegetables with colors and smells helps to improve astronauts’ well-being.”