【推荐1】In habitats across the planet, animals periodically drop everything to walk, fly or swim to a new place. Wildlife such as whales and geese learn migration paths by following their parents. Others, including small songbirds, gain the distance and direction of their migration within their genetic code. And some animals use a combination of genetics and culture to guide their migration.

Another group of migrators does not quite fit either model, and researchers have only recently started to figure out how they find their way. Take the Cory’s shearwater, an oceangoing sea bird that migrates over the Atlantic every year. The young do not migrate with their parents, so culture cannot explain their journeys. And the exact paths vary wildly from individual to individual, making genetics equally unlikely.

Cory’s shearwaters are long-lived, rarely producing young successfully before age nine. This leaves an opening for learning and practice to develop their migration patterns. Researchers call this the “exploration-refinement”, and until now it has been hypothetical (假设的) because of difficulties in tracking migratory animals’ movements.

But a team of researchers has done that by attaching small geolocators to more than 150 of the birds aged four to nine. They found that younger birds traveled longer distances, for longer periods, and had more diverse paths than older birds. “We finally have evidence of the ‘exploration-refinement’ for migratory birds,” says Letizia Campioni, who led the study. Younger Cory’s shearwaters are able to fly just as fast as the adults—but they do not, suggesting that the young do more exploring, which gradually fades as they mature and settle into a preferred course.

Although it may seem less efficient than other strategies, “exploration refinement could be beneficial to birds and other organisms in a rapidly changing world due to unpredictable man-made changes,” says Barbara Frei. “It might be safer to repeat a behavior that was recently successful than to rely on patterns that were perfected long ago but might no longer be safe.”

【推荐1】Man’s best friend is also his oldest. The partnership between dogs and people may go back as much as 40,000 years long predating any other domestication （驯化）. And it is based not, as is the case with many succeeding domestications, on a human desire to eat the animal concerned, or to consume some associated product such as milk or eggs, but rather on sincere companionship, though with a little work — and hunting-related using on the side.

How this partnership got going, though, is debated. In particular, unlike other domestications, which involved groups of people who had taken up farming, the domestication of the wolves that became dogs happened while all human beings were still hunter-gatherers. The two species were, in other words, competitors. Yet they managed to become soul mates.

One popular theory is that the wolves which became dogs acted as rubbish cleaners for groups of people, by eating their waste, possibly including their faeces （粪 便）.That, though, would be a service more useful to settled farmers than mobile hunter-gatherers. As she writes in Scientific Reports, however, Maria Lahtinen of the Finnish Museum of Natural History thinks she might have the answer as to how wolves and people squared the competitive circle while both species were still hunters. It was, she and her colleagues suggest, simply a matter of remaining calories.

The archaeological （考古的）evidence suggests that wolves were domesticated in wood lands at the edge of the ice sheets of the last ice age, since that is where almost all Palaeolithic dog remains have been found. Dr Lahtinen calculates that, given the large size of hunted animals in this environment, and humans' need to eat a balanced diet with plenty of plant matter in it as well as flesh, there would have been a lot of remaining meat around from kills. What better way to use some of it than to feed a few wolf cubs （幼崽）to provide entertainment and companionship? And thus, she suggests, were dogs born.

【推荐3】In a digital age, we almost never write things by hand. However, multiple studies have shown that this act has many benefits.

New brain research, led by researchers at the Norwegian University of Science and Technology, confirms the same: choosing handwriting over using a keyboard results in better learning and memory.

The study was conducted using equipment to track and record brain wave activity. The participants included 12 young adults and 12 children. This is the first time that children have participated in such a study. Each subject was asked to write by hand and type on a keyboard while wearing a hood with over 250 electrodes. The sensors in the electrodes are very sensitive and pick up the electrical activity that takes place in the brain. Each examination took 45 minutes per person.

The results showed that the brain in both young adults and children is much more active when writing by hand than when typing on a keyboard. According to Van der Meer, plenty of senses are activated by pressing a pen on paper, seeing the letters written and hearing the sound made while writing. These sense experiences build contact between different parts of the brain, opening the brain up for learning.

Van der Meer believes that the results stress the importance of children being challenged to draw and write at an early age, especially at school. ''Learning to write by hand is a bit slower process, but it's important for children to go through the tiring phase of learning to write by hand," she said.

The hand movements used to form the shapes of letters are beneficial in several ways. "If you use a keyboard, you use the same movement for each letter. Writing by hand requires control of your fine motor skills and senses. It's important to put the brain in a learning state as often as possible," Van der Meer added.