【推荐1】Which are the better pets, cats or dogs? Staff from New Horizon network team have carried out a study which lasted a fortnight and they published their conclusion on their home page last Friday — dogs are better pets than cats by a whisker.

Staff from New Horizon first listed the areas where cats fared better. These included having bigger brains compared to their body size, which is said to make them do better in complex functions such as memory and attention than dogs. Cats’second point was given for being more popular, with 204 million living in the top ten cat-owning nations compared to 173 million dogs in the ten countries where dogs are favored. Cats also get more attention from humans, with purrs (呼噜声) and miaows easily to be noticed. Although dogs can vary their barks, they cannot match the attention-seeking of cats. Additionally, cats can see in lower light than dogs and have a far wider hearing range and a sharper sense of smell. They are also said to be “greener” pets because their smaller appetites mean less area of land required to farm the food.

But in the other six categories examined — many of which related to getting on with humans — dogs had the edge.

Dogs have a longer shared history with humans, maybe as long as 135,000 years. Cats are relative newcomers to our homes. Similarly, dogs have a greater ability to bond with the 订masters. Even four-month-old puppies choose a human companion over another dog. Dogs scored a third point for their better powers of understanding and following human gestures. One study found that a dog called Rico had mastered the meaning of more than 200 words. The ab 山 ty to perform roles such as being a guide dog for the blind meant dogs were rated better than cats when it came to their problem-solving abilities. And they are easier to train.

With the scores tied at five-all, the deciding point fell on usefulness — with dogs coming out on top.

Dogs, studies show, help cut human stress, while taking them for walks keeps their owners fit and helps them meet new people. New Horizon says: “Dogs can hunt and guard. They can sniff out drugs and bombs; they guide blind and deaf people, find someone buried in ruins, and possibly even predict earthquakes.”

The study conducted by the staff and their conclusion went viral the moment it was released and has caused a heated discussion among pet owners. Some frowned at it, arguing that it had only involved character, intelligence and usefulness.

【推荐2】Animals have developed a circadian clock—an internal body clock that runs in 24-hour cycles. It is regulated by cues (提示) from their environment. But they may suffer from a “jet lag （时差反应）” when the cues animals are exposed to do not match the ones of their natural environment.

Kristine Gandia, a PhD student at the University of Stirling in Scotland, and a team of observers set out to understand how the “jet lag” of living in latitudes (纬度) that animals were not used to can affect them. Giant pandas were chosen as the focus for the study partly because they live highly seasonal lives.”

“Giant pandas are very good animals to focus on,” Gandia said. “They are very popular in zoos and there are a lot that have cameras so we can see how their behavior changes across different latitudes. These cameras enabled us to monitor the giant pandas’ behavior across a 24-hour period.”

Gandia explained that the latitudinal range for giant pandas is between 26 and 42 degrees north. Matching latitudes could also be considered between 26 and 42 degrees south, as these mirror the temperature and lighting conditions.

The team monitored 11 giant pandas in six different zoos. Some zoos were within the animals’ natural latitudes but in other countries and the others were outside that range.

Gandia explained, “We recorded giant panda behavior, trying to account for behaviors that are positive, neutral (中性的) and negative indicators for welfare. So, this would include behaviors like play and grooming as positive behaviors, drinking and defecating as neutral maintenance behaviors, and several abnormal behaviors as negative behaviors, with pacing being the most common.”

Those living in zoos outside of their home latitude were found to be less active and display more negative behaviors.

“Giant pandas living in zoos could be suffering from a ‘jet lag’ if their body clocks don’t match their environments,” Gandia said.

【推荐3】Scientists recently conducted a study that involved giving pet parrots (鹦鹉) a tablet. They could use the tablets to make video calls to other parrots. It turned out that the birds showed signs of feeling less isolated (孤独的). They also began to engage in more social behaviors, including cleaning their feathers, as well as singing and playing.

Ilyena Hirskyj-Douglas, a co-author of the study, works at the University of Glasgow, Scotland. She said that video calls had helped many people feel less isolated. “There are 20 million parrots living in people’s homes in the U. S., and we wanted to explore whether those birds might benefit from video calling, too,” Hirskyj-Douglas saíd. “If we gave them the opportunity to call other parrots, would they choose to do so, and would the experience benefit the parrots?”

In order for the parrots to use their tablets, the birds first had to learn to ring a bell. They could then touch a photo of another bird on the screen to call that bird. The birds were also given a choice of which “friend” to call. In total the birds made 147 deliberate calls to each other during the study. Scientists took detailed notes on the birds’ behavior and later reviewed the video footage (片段).

Their analysis suggested that there were, indeed, benefits for the birds. In the wild, many parrots live in large groups. As pets, they tend to be kept alone or in a small group. Isolation and boredom can cause birds to develop psychological problems. These are problems related to the mind and behavior. These problems can look like rocking, pacing back and forth, or self-harming behaviors such as feather-plucking.

Rébecca Kleinberger, who works at Northeastern University in Massachusetts, also helped with the study. She said video calling could reproduce some of the social benefits of living in a larger group.

【推荐2】As people travelling by air become increasingly aware of their carbon footprint, flying has become not only one of the most polluting industries, but also one with the most potential to turn things around.

After Solar Impulse 2 completed the world’s first flight by a solar-powered aircraft in 2016, airlines and aircraft producers looked to become the first to provide a commercial plane. Bertrand Piccard, one of the pilots responsible for Solar Impulse 2’s journey said, “All the clean technologies we’ve already had can be used everywhere. We have to use them, not only for the environment, but also because they are profitable and able to create jobs.”

The following year saw many projects in the aviation (航空) field as the airline industry acknowledged the future of low- carbon transportation methods. In 2017, Zunum Aero, a small aviation company which focused on delivering a range of hybrid-electric (混合电动的) planes received financial aid from JetBlue and Boeing, whilst EasyJet teamed up with Wright Electric to develop battery-powered aircraft and NASA also announced its plans to develop its own electric aircraft.

Orkney Islands, lying about 20 miles north of the Scottish mainland, are rich in renewable resources, especially the wind energy. Loganair, a Scottish airline, is cooperating with aviation companies to make Orkney the world’s first fully electric airline routes. However, this is never easy. Due to the limited size and weight of a battery that an airplane can carry, airplane producers are faced with a bottleneck — the continued power supply for electric airplanes. They believe the abundant wind energy in Orkney could be the key to solving it.

The benefits of electric air travel transcend its low-carbon emissions. Aviation experts believe these aircraft’s power source will also mean they will be less noisy, smaller, require less maintenance costs, and need a shorter runway to take off and land — this could lead to more airports in small cities and more rural areas being connected to the world at large.