The baby is just one day old and has not yet left hospital. She is quiet but alert (警觉的). Twenty centimeters from her face researchers have placed a white card with two black spots on it. She stares at it carefully. A researcher removes the card and replaces it by another, this time with the spots differently spaced. As the cards change from one to the other, her gaze(凝视) starts to lose its focus—until a third, with three black spots, is presented. Her gaze returns: she looks at it for twice as long as she did at the previous card. Can she tell that the number two is different from three, just 24 hours after coming into the world?

    Or do newborns simply prefer more to fewer? The same experiment, but with three spots shown before two, shows the same return of interest when the number of spots changes. Perhaps it is just the newness? When slightly older babies were shown cards with pictures of objects (a comb, a key, an orange and so on), changing the number of objects had an effect separate from changing the objects themselves. Could it be the pattern that two things make, as opposed to three? No again. Babies paid more attention to squares moving randomly(随意地)on a screen when their number changed from two to three, or three to two. The effect even crosses between senses. Babies who were repeatedly shown two spots became more excited when they then heard three drumbeats than when they heard just two; likewise(同样地) when the researchers started with drumbeats and moved to spots.

    Before we came to Canada in 1951, when I was three, my parents and I spent a year at refugee camp (难民营) in Austria. We had escaped from what was then called Czechoslovakia. My parents had already lost their livelihood once to the Nazi. Mummy was freed from the Nazi concentration camp Bergen-Belsen and spent the years after the war trying to find her family, only to discover she was the only survivor. She met my father in a small town outside Prague. They married and had me in 1948. When we arrived in Montreal, everything we owned was contained in an army trunk and a couple of army blankets. Mummy bought an old sewing machine and some inexpensive materials and using patterns in magazines, taught herself to sew. Her hands were always going, making something. She learned English by singing along to the hit song as she worked.

    For me, high school was a lonely time. My mother worried that I'd never come out of my shell so she signed me up for classes at the Montreal Children's Theatre. That's where I found my voice with her strong faith in me, Mummy had opened a door. Although she was an educated woman, I never heard my mother said “This is what I gave up for you.” She was always there for my younger brother and me. When I sat in the kitchen with her, I felt safe. When she made soup or sewed a ballet costume for me, it was all a gift, a labor of love. She wanted to make us happy. For a long time, I had a picture hanging in the kitchen saying “Put your heart into it.” I grew up with that phrase. Mummy taught that lesson by example, and it has become my own work ethic(职业道德).

    Mary bought a dress in a women's clothing store.She felt very happy about buying the dress until she got home. Then she remembered she had left her purse at the store.It was the third time that month that Mary had forgotten something important.Mary was angry with herself.She said,“Am I losing it?”

    Emma was teaching a class in mathematics at a college.She began to explain to the students how to solve a very difficult problem.She understood it very well.But somehow,at that moment,she could not explain it.Emma said,“I must be losing it.”

    Americans seem to have a lot of concern about losing it.At least that is what you would think from hearing them talk.They use the expression when they feel they are losing control.It can mean losing emotional control.Or losing the ability to do something.Or losing intelligence.

    Word experts differ about how the expression started.Some believe it came from television programs popular in the 1980s.Others believe it began with psychologists,who deal with how people think,feel and act.

    “We Americans have many concerns about controlling our lives.Perhaps we worry too much,”one psychologist said.“In many situations to say you are losing it eases the tension（不安）.”

    It's healthy.And most people who say they are having a problem are not losing it.

    People may feel more like they are losing it when they are “down in the dumps”.Word expert Charles Funk says people have been feeling down in the dumps for more than 400 years.The word dumps probably comes from Northern European countries.The languages of Denmark and Norway both have similar words.The words mean to fall suddenly.Americans borrowed this saying.And,over the years,it has become a popular way of expressing sadness.

    Looking for new and creative ways to reach your fitness goals? Now's the time to check out the following hottest fitness apps for the new year.

    Hot5

    Platform: iOS

    Cost: Free

    Hot5 contains pages and pages of 5-minute video workouts that are easy to follow. You can find video workouts of all varieties and difficulty levels that will work you out with only five moves. Hot5s are modern. It is also beautifully designed and user friendly.

    GymPact

    Platform: iOS, Android

    Cost: Free

    We all need a little motivation when it comes to working out, and GymPact is a perfect way to get inspired. Make a commitment to working out a certain number of times a week. Choose the amount of money you are willing to risk. If you don't achieve your goal? Your credit card gets charged. Achieve your goal? You get paid!

    Fitocracy Macros

    Platform: iOS

    Cost: Free

    More than just a calorie-counting app, Fitocracy Macros tracks only the calories you take in. You'll have to research how many calories are actually in the food you eat. That aside, it's a simple and easy app that will help you achieve your dieting goals.

    Zombies, Run! 2

    Platform: iOS, Android

    Cost: 25yuan

    Zombies, Run! 2 mixes games and stories into your run as you complete missions in a world full of zombies. Whether you're gathering supplies, saving a fellow human, or avoiding a crowd of the undead, this app adds excitement to your normal jog with imagination and competition.

    Google, hoping to put down a protest by employees upset that the technology they were working on could be used for deadly purposes, will not renew a contract with the Pentagon(五角大楼) for artificial intelligence work when a current deal expires next year.

    Diane Greene, who is the head of the Google Cloud business that won a contract with the Pentagon's Project Maven, said during a weekly meeting with employees Friday that the company was backing away from its AI work with the military, according to a person familiar with the discussion but not permitted to speak publicly about it.

    Google's work with the Defense Department on the Maven program, which uses artificial intelligence to interpret video images and could be used to improve the targeting of drone strikes, riled the internet giant's workforce.

    About 4,000 Google employees signed a petition(请愿书) demanding "a clear policy stating that neither Google nor its contractors will ever build warfare technology," and a handful of employees resigned in protest.

    The money for Google in the Project Maven contract was never large by the standards of a company with profit of $110 billion last year — $9 million, one official told employees, or a possible $15 million over 18 months, according to an internal email.

    But some company officials saw it as an opening to much greater revenue down the road. In an email last September, a Google official in Washington told colleagues she expected Maven to grow into a $250 million-a-year project, and eventually it could have helped open the door to contracts worth far more.

The American Psychological Association（APA） has issued its first advisory on social media use in adolescence（青春期）. What's most striking in its data based on recommendations is how little we really know about how these apps affect our kids.

The relative newness of platforms like Snapchat and Tik Tok means little research is available about their long-term effects on teen and tween brains. Getting better data will require significant funding—and much more openness from tech companies.

"What little evidence we do have unsurprisingly suggests that social media trades on motivators that aren't great for young brains. Many kids' first exposure to social media occurs at the worst possible time when it comes to brain development," says Mitch Prinstein, a psychologist and neuroscientist at the University of North Carolina（UNC）.

"Things like 'button and artificial intelligence（in general）' are going to affect young people's brains in a way that's very different from adult brains when it comes to the desire to stay online and to say or do almost anything to get followers." When it comes to social interactions, he compares kids' brains to a car with a huge gas pedal and weak brakes（刹车）.

Earlier this year, Prinstein and his UNC colleagues published the results of one of the first studies of how the adolescent brain reacts to social media. The team surveyed a group of middle schoolers to understand their social media habits, and then stuck them in an MRI machine to watch their brains as they reacted to social rewards or punishments. They found that 12-year-olds who habitually checked social media had distinct neural patterns, with more activities over time in parts of the brain associated with motivation, salience（or where attention is focused） and cognitive control.

The team didn't weigh in on whether those differences were good or bad, or whether the relationship was causal or correlational. But their work points to the need for more research. It should also remind parents of the need to be keenly aware of social media's hidden influence on still-developing brains.