Dr. Sasaki knew the first-night effect probably has something to do with how humans evolved.

    The puzzle was what benefit would be gained from it when performance might be affected the following day. She also knew from previous work conducted on birds and dolphins that these animals put half of their brains to sleep at a time so that they can rest while remaining alert enough to avoid predators (捕食者). This led her to wonder if people might be doing the same thing. To take a closer look, her team studied 35 healthy people as they slept in the unfamiliar environment of the university's Department of Psychological Sciences. The participants each slept in the department for two nights and were carefully monitored with techniques that looked at the activity of their brains. Dr. Sasaki found, as expected, the participants slept less well on their first night than they did on their second, taking more than twice as long to fall asleep and sleeping less overall. During deep sleep, the participants' brains behaved in a similar manner seen in birds and dolphins. On the first night only, the left hemispheres (半球) of their brains did not sleep nearly as deeply as their right hemispheres did.

    Curious if the left hemispheres were indeed remaining awake to process information detected in the surrounding environment, Dr. Sasaki re-ran the experiment while presenting the sleeping participants with a mix of regularly timed beeps (蜂鸣声) of the same tone and irregular beeps of a different tone during the night. She worked out that, if the left hemisphere was staying alert to keep guard in a strange environment, then it would react to the irregular beeps by stirring people from sleep and would ignore the regularly timed ones. This is precisely what she found.

    The weather is very important to farmers. The calendar might say “August”， but the weather's more like October. For some farmers the cool weather is a good thing. For others, it's a cause for concern.

    At Apple Hill, the cooler weather was giving the Boeger Winery a chance to concentrate on bottling instead of picking. “Things were really maturing, it has just been a welcome relief to have more time to prepare.” said Greg Boeger of Boeger Winery.

    But down in the Delta, the earlier hot weather has them two weeks ahead of schedule. Their harvest actually started on Tuesday, and this cooling trend is a worry. There have been no problems yet, but for each of the last two years heavy rain right after Labor Day was a problem, one that Don Pylman would not like to see repeated.

    “If it doesn't start raining, we're in good shape，” said Pylman. “If the sun comes out and clears up we can get right back to work, but if we do get rain, the rots will start.”

    The kind of grape makes a difference as well. Thin­skinned grapes like the chardonnay variety are much more sensitive to rain than some of the others. They're also more difficult to dry off.

    Incredible Women You Didn't Learn About in History Class

    Here are the stories of women you may not know about, but definitely should

    Maria Sibylla Merian

    Born in Germany in 1647, Merian was fascinated by insects, and she began collecting, studying, and drawing them when she was as young as 13. She was one of the few naturalists of her time to actually study live insects. It was through her study of caterpillars(毛毛虫) that she discovered the truth about their life cycles. Her work provided major contributions to the field of entomology（昆虫学）。

    Murasaki Shikibu

    Murasaki Shikibu, a Japanese woman, was widely considered to be the world's first novelist. She was a noble woman living in Japan around the year 1000 AD. She wrote a two-part novel called The Tale of Genji, which tells a riches-to-rags story about the son of a Japanese emperor forced to live as a common man. The Tale of Genji is widely considered to be a masterpiece of Japanese literature.

    Ada Lovelace

    Ada was working to design early computing machines that she hoped would be able to quickly solve math problems. In addition to designing this early computer program, she also was first to suggest that these computers might be able to do more than, well, calculate. She imagined them doing everything, from producing images to composing music.

    Lucy Stone

    Born in 1818, Stone married a fellow activist and changed her name, but decided to change it back a year later. She held the belief that "a wife should no more take her husband's name than hers." She became the first American married woman to keep her maiden name for her entire life. Stone was also one of the founding members of the American Equal Rights Association and fought for the ending of slavery.

    Moments before I could lift my case to put it in the plane's overhead locker ahead of our recent holiday to Europe, my father gently urged me to stop. He held the thick handles of the case and lifted it with his thin arms, pushing it into place with a sigh. “You should relax and be the lady, and let me do the heavy tasks,” he said seriously. “In the future, someone special will come into your life and take over such tasks from me, but that will never happen if you do everything yourself.”

    I was stunned into silence. This was not the father I remembered from childhood, who trained me to study hard at school, asked me to earn my own pocket money as a teenager at a local coffee shop, and even taught me household chores so that my life alone in London wouldn't turn into a mess. But then, eight years after I left home and started a new life in the UK, I realized for the first time that my dad still has expectations for me to be like a princess and to stay dependent and delicate, which were considered necessary qualities of women in traditional China.

    Well, that came a little late. Little did Dad know that over the three years of my university life, I moved flats five times all by myself, dragging suitcases of books and clothes, and waiting for the taxi in the rain while holding tight onto cardboard boxes. Meanwhile, living in the UK – a country currently led by a female prime minister – I have never thought there is anything girls cannot do. Most of my female friends are professionals working in the City of London, and after work, we frequently go down to the pub for a drink, just like the guys do – something my mother never did.

    I wondered how I might make Dad understand the new world his little girl has entered. Perhaps one day, he will realize the “someone special” in my life will appreciate my confidence and independence above dependence, and admit that times have changed.

    When pups are between 2 and 3months old, their mothers will abandon them for any number of reasons. With no mother to watch out for them, infant (婴儿) mortality of pups under one year skyrockets (飞涨) to around 90%. So, only about 10% of motherless, homeless pups survive.

    Without mothers, how are these abandoned pups supposed to survive? For the study, researchers Clive Wynne at Arizona State, Nadine Chersini at Utecht University, and Nathan Hal at Texas Tech University brought in 51 college students and asked them to rate the attractiveness of headshots (头部特写) of puppies at different ages.

    The pups peaked at different ages, but they were all ranked likable between six to eight weeks, since newly abandoned pups are competing with each other for human heartstrings (怜悯), evolution says they should be most likable around 6 and 11 weeks. This is around the time they are weaned (断奶) and let go of by their mothers.

    There are a few characteristics that humans find particularly adorable across species: big, forward-facing eyes, floppy and unstable limbs (肢), and a soft, rounded body shape. We're also keen to scream when animals have large heads in comparison to their bodies, and this reaction goes back to evolution.

    Called kinderschema (婴儿萌), these qualities are also apparent in human babies and necessary for their survival. The characteristics activate the decision-making part of the brain to encourage you to protect and nurture the baby. At the same time, the brain's pleasure center releases dopamine (多巴胺). With these two reactions, your brain makes you want to protect the baby and rewards you for doing so. With your protection, the baby can survive.

This was no ordinary class. The students who came together were all science or engineering professors at Cornell University. They had interrupted their research to accept an invitation to take part in an unusual experiment: "an interesting week of poetry". This class was part of a study to answer the questions: Why is science difficult for many non-science students? What can teachers learn about teaching if they take a class that is not in their field? 

The students in the poetry class listened to lectures and took notes. They had reading tasks and had to write three short papers. All students noticed one thing—the importance of spoken words. In science and engineering classes, the instructors put tables and drawings on the blackboard. But in this poetry class, the instructors just talked. They didn't write anything on the board.

The scientists and engineers noticed one similarity between science and poetry. In both subjects, students need to find layers of meaning. Some layers are simple, clean, and on the surface;   other layers are deeper and more difficult. This search for different levels of meaning doesn't happen much in undergraduate science classes, but it is important later, in a graduate school. And it is always important in humanities (人文学科).

Both the poetry instructors and their students learned something about teaching from this experience. One poetry instructor, for example, now sees the importance of using careful, clear definitions when he explains a poem. He also plans to be more informative as he teaches. Most of the scientists agreed on several points. Firstly, humanities classes might help science students to see patterns and decide which information is important. Secondly, the poetry class was fun. One engineer decided, "We need to change the way we teach engineering to make it an enjoyable experience for students."

But perhaps the most important result of the experience was this: all of the professors began to think about how they teach and how they can teach better.