Twelve years ago, Danny called me from a dark, damp subway station. “A baby!” he shouted. “Get down here, and flag down a police car or something.” By nature, Danny is a remarkably calm person, so when I felt his heart pounding through the phone line, I ran.

    When I got to the subway station, Danny was holding a light-brown-skinned baby, about a day old. The baby had been wrapped in an oversize black sweatshirt and left on the ground in a corner behind the gate.

    Three months later, Danny appeared in family court to give an account of finding the baby. Suddenly, the judge asked, “Would you be interested in adopting this baby?” The question stunned everyone in the courtroom, except Danny, who answered, simply, “Yes.”

    “But I know it's not that easy,” he said.

    “Well, it can be,” assured the judge before barking out orders to allow me to be a parent-to-be.

    My first reaction, when I heard, went something like: “Are you crazy? How could you say yes without consulting me?”

    In three years as a couple, we had never discussed adopting a child. I was an ambitious playwright working as a part-time word processor. Danny was a respected yet wildly underpaid social worker. We had a roommate, who slept in our living room, to help pay the rent.

    We knew how many challenges couples usually faced when they wanted to adopt. And while Danny had patience and selflessness, I didn't know how to change a diaper(尿布), let alone nurse a child. I didn't trust the system and was sure there would be obstacles. Also, I couldn't handle parenthood. So I promised myself I wouldn't get attached.

    The caretaker held him and then placed him in my arms. But when the baby stared up at me, with all the innocence and hope he represented, I, like Danny, was completely hooked.

    The TED speaker series features “ideas worth spreading”. With over 1,400 to choose from, we've selected a few that are perfect for students.

    Larry Smith: Why you will fail to have a great career

    We humans may have an unfavorable habit of making excuses for ourselves of or being too confident about ourselves. Accordingly, Larry Smith, a professor of economics at the University of Waterloo in Canada, tells us why most of us will fail to have a great career. Luckily, as he puts it, there is a way out-follow your heart, as long as it is good for your career.

    Andy Puddicombe: All it takes is 10 mindful minutes

Between dance team, volunteering and –oh, right—lectures, your life's crazy factor（因素）is about to go way up. In this entertaining and informative talk, Mindfulness, expert Andy Puddicombe teaches us how to be “more healthy, more mindful and less distracted” by taking just 10 minutes out of the day to be “more present”.

    Shane Koyczan: To this day…for the bullied（欺凌）and beautiful

    This talk is sure to stay with you. Shane Koyczan's “To This Day” is an affecting spoken-word poem about bullying and being different that gained over 10 million views on YouTube. In this talk, Koyczan gives a live reading of the poem, along with some stories about his background.

    Susan Cain: The power of introverts（性格内向者）

    Does a cup of tea and a good book sound like a perfect Friday night? In this personal talk, Susan Cain argues that introverts have talents and abilities. Our culture may value being outgoing, but the world needs all kinds.

    Let's face it. No one drinks diet sodas for the taste. People drink diet sodas in the hope that it will help them lose weight or at least keep them from gaining it. Yet it seems to have exactly the opposite effect, according to a new study.

    Researchers from the University of Texas said those who drank two or more diet sodas a day had waist size increases that were six times greater than those who didn't drink diet sodas. ＂What we saw was that the more diet sodas a person drank, the more weight they were likely to gain,＂ said Sharon Fowler.

The study was based on data from 474 participants in a large, ongoing research project, where the participants were followed for nearly 10 years.

    While the findings are surprising, they also offer some explanations.

    Nutrition expert, Melanie Rogers, who works with overweight patients in New York, has found that when patients are switched from regular to diet sodas, they don't lose weight at all. ＂We weren't seeing weight loss necessarily, and that was confusing to us,＂ said Rogers.

    So why would diet soda cause weight gain? No one knows for sure yet, but it could be that people think they can eat more if they drink diet sodas, and so over-compensate for the missing calories.

    A related study found some sweeteners (甜味剂) raised blood sugar levels in some mice. ＂Data from this and other potential studies suggest that the promotion of diet sodas and artificial sweeteners may be risky,＂ said Helen P. Hazuda, professor at the University of Texas's school of medicine. ＂They may be free of calories, but not of consequences.＂

    If you want to travel from Xi'an to Chengdu by train, it will take about 16 hours. But starting this month, the new Xi'an-Chengdu high-speed railway will shorten this travel time to three hours.

    The 643-kilometer line is China's first high-speed railway to run through the Qinling Mountains, which form a natural boundary (分界线) between China's north and south. With a speed of 250 km per hour, it's also the first mountain-heavy train line to provide a 4G network. Along the way, the train passes through two areas for rare (稀有) wild animals — one for pandas and the other for crested ibises (朱鹮).

    To reduce the railway's influence on the animals, workers and experts have designed and built the railway to be environmentally friendly. There were 345 wild pandas living in the Qinling Mountains. China currently has 1,864 wild pandas in total, according to the Xinhua News Agency.

    To avoid disturbing the pandas, the railway was designed to run through tunnels (隧道) within the area. Protective shields (防护屏) are placed near the entrance of each tunnel to stop animals from going in.

    To protect the thousands of crested ibises that fly near one part of the railway, protective nets have been set up to make sure the birds will not fly into a train.

    The nets are about 32 km long and 4 meters high. Experts tested different shapes and materials for building the nets before making their final choice.

    It is a psychological strategy that all parents will be familiar with: instead of scolding an misbehaving child, focus instead in rewarding them for good behaviour.

    Now the idea is well received outside the nursery, with implications for everything from recycling clothes to policing.

    Consumers end up with piles of unwanted clothes. Every year in the UK, 300,000 tonnes ends up in landfill — 235 million individual items.

    Now however, apps such as ReGain, Regive and Stuffstr are making it simpler — and more worthwhile — for people to return their unwanted clobber.

    The ReGain app can be used to find one of 20,000 drop-off points. In return, the diligent consumer earns rewards such as discount coupons for high street retailers. Stuffstr works in partnership with John Lewis to help people get cash in return for unwanted items from the chain.

    “Possibly the one prediction that we economists get right is that if you incentivise (激励) a behaviour, you will get more of it,” says Dr Matthew Levy, a lecturer in economics at the London School of Economics.

    He cites research, including his own, showing that financial incentives encouraging regular exercise, stopping smoking and losing weight effectively promote healthy behaviours and that there is no backlash when the incentives are removed.“If anything, the incentives can be used to jump-start a healthy habit that keeps going,”he says.

    In the four months after its launch, the ReGain scheme received almost 17,000 parcels containing 47 tonnes of used clothes and shoes, of which 95% could potentially be reused, according to its founder Jack Ostrowski.

    “We need to find a way to influence behaviour, and discount coupons help,” he says. The platform is also working with brands and retailers to find ways to divert used clothes from landfills and into the production of new clothes, he adds.

    Other reward schemes have had success in encouraging behavioural change.

    When police in Canada issued “positive tickets”— coupons for free food or movie tickets — to reward good behaviour among young people, they reported an almost 50% drop in youth-related service calls.

    “My officers would say' In the old days we'd drive up in the police car and the kids would run away from us, now they run to us'.”

    In a similar venture, Hull city council have announced plans to launch a digital reward token — the HullCoin — that can be earned by volunteering and spent at local retailers.

    Elsewhere, a study on the recruitment of health workers in Zambia found that highlighting economic incentives during the recruitment process caused future employees to be more motivated and task-focused.

    “Obviously different groups are motivated by different factors,” says Ostrowski. “For some, the feel good factor is enough, and for others, that reward stimulus is required.”

    When Lina was awoken by the sound of thunder, she was alone on the island. The air was cool and bullfrogs croaked. It was that brief moment when the summer sun had set but the stars hadn't yet appeared. Lina rubbed her eyes and looked around.

    "Hello?" she called. "Celia? Marie?"

    There was no response.

    The moon was rising now, shedding light on the island. They had always called it "Forgotten Island" because no one but they seemed to remember its existence. It wasn't on any of the maps they could find, and even the forest rangers didn't know about it. Lina loved that the island, hidden in a heavily-wooded side stream of the river, was a secret between the three friends -her, Celia, and Marie.

    But now Lina was here alone, and it was night. Worse still, it was her own fault.

    "Come on, Lina, let Marie row the boat." Celia had said. Marie was two years older than Lina, but she was a hopeless rower. That's why Lina refused and rowed the boat to the island. The argument that followed the refusal took the usual form. Celia took Marie's side, as she always did. Lina had exploded and yelled at them to just leave. So they got back in the boat and left.

    A bolt of lightning crossed the darkened sky, accompanied by a deafening thunder clap. The storm was here. As the first cold raindrop slid down her neck, Lina's mind returned to her current problem. She was stuck here by herself. She just hoped she didn't become as forgotten as the island. The thought of it sent a chill（寒意）down her back.

    Suddenly, Lina spotted something in the water. It was a boat, and inside it were Marie, Celia, and Marie's dad, who was steering through the fast flowing waters. As the boat approached, they saw Lina waving and the worried expressions on their faces turned to relief.

    In her excitement Lina jumped into the river. Only once she was in the icy water did she remember how fast the water was moving. Luckily a strong arm reached into the water and pulled her out. She smiled weakly at Marie's dad and, without a word, hugged Celia and Marie. They didn't seem to mind becoming wet.