When I looked at the grade on my math paper my jaw (下巴) almost dropped to the ground: a big “65” in bright red ink. I had never received such a terrible grade before.

    I was so ashamed that when I got home that afternoon I lied to my dad. I told him I got 85 and that the report wouldn't come until the end of the month. Dad smiled. His daughter would never lie about her grade, so he didn't doubt the unusual delay (延迟) of my report.

    A month later, Dad casually (随意地) asked me again about the report at the dinner table. He looked right into my eyes and asked for an answer. Having no choice. I told him that I had in fact got just 65 in my math final. I had lied because I didn't want to let him down.

    For a moment, he just looked at me. I would have preferred a telling off (斥责) than that silence. Finally, Dad said, m a hurt voice, “You have already let me down, with your lie. I am not disappointed at your math score. That is no big deal-on one can be perfect all the time. But I am very disappointed in you. If you can't be honest with your dad. who can you be honest with? It's much easier to achieve a better grade than rebuild someone else's trust in you.”

    Dad's words touched my heart. I couldn't forgive (原谅) myself for having hurt his feelings I took out the report that I had been hiding for weeks, handed to him and apologized, sincerely I realized that my honesty is not only important to me personally, but to those around me that truly care .about my well-being (幸福).

    In one of Shakespeare's plays a character says: “No legacy (遗产) is so rich as honesty.” After the crisis between Dad and me, I began to understand those words.

    There's a new frontier in 3D printing that's beginning to come into focus: food. Recent development has made possible machines that print, cook, and serve foods on a mass scale. And the industry isn't stopping there.

     Food production

    With a 3D printer, a cook can print complicated chocolate sculptures and beautiful pieces for decoration on a wedding cake. Not everybody can do that — it takes years of experience, but a printer makes it easy. A restaurant in Spain uses a Foodini to "re-create forms and pieces" of food that are "exactly the same," freeing cooks to complete other tasks. In another restaurant, all of the dishes and desserts it serves are 3D-printed, rather than farm to table.

    Sustainability(可持续性)

    The global population is expected to grow to 9.6 billion by 2050, and some analysts estimate that food production will need to be raised by 50 percent to maintain current levels. Sustainability is becoming a necessity. 3D food printing could probably contribute to the solution. Some experts believe printers could use hydrocolloids (水解胶体) from plentiful renewables like algae(藻类) and grass to replace the familiar ingredients(烹饪原料). 3D printing can reduce fuel use and emissions. Grocery stores of the future might stock "food" that lasts years on end, freeing up shelf space and reducing transportation and storage requirements.

    Nutrition

    Future 3D food printers could make processed food healthier. Hod Lipson, a professor at Columbia University, said, "Food printing could allow consumers to print food with customized nutritional content, like vitamins. So instead of eating a piece of yesterday's bread from the supermarket, you'd eat something baked just for you on demand."

    Challenges

    Despite recent advancements in 3D food printing, the industry has many challenges to overcome. Currently, most ingredients must be changed to a paste(糊状物) before a printer can use them, and the printing process is quite time-consuming, because ingredients interact with each other in very complex ways. On top of that, most of the 3D food printers now are restricted to dry ingredients, because meat and milk products may easily go bad. Some experts are skeptical about 3D food printers, believing they are better suited for fast food restaurants than homes and high-end restaurants.

    When Iwas.in the third grade, we had a hunt at school. We gathered up chalk，pencils，stones, and so on, rapidly filling our checklists. It was a very close race. I was out of breath when I reached the clover (三叶草)patch in search of the last, most hard-to-find item: a four-leaf clover.

    I was pretty sure that I was going to win. 1 have always been able to find four-leaf clovers. I just see them.

    I spent my childhood collecting and pressing four-leaf clovers into books at my mother's house. I started with big cloth- and leather-bound books. When I ran out of romantically bound volumes, I began to put my treasures into anything I could find: fiction paperbacks, cookbooks. The same is true in my house today. Shake a book, and a papery treasure just might fall into your hand.

    A few years ago, in Nova Scotia, my husband and I pulled off the road for a picnic. The ground was thick with clover. Some shoots had four, five, even six leaves. I lined them up on the picnic table to admire as my husband, never yet having found one four-leaf clover, looked on with awe. To me, it was simple. The differences in their shapes popped out, breaking the pretty pattern of the conventional clovers with their three perfect leaves.

    Two summers back, while waiting for an airport shuttle in Munich, I found a tiny four-leaf clover in a traffic circle and put it into my passport. On the way home, my husband and I were upgraded to business class. Friends attributed our good luck to the clover. I think, it's more likely that we were upgraded because a kind customer service officer took pity on us.

    People disagree about whether the luck lies in the finding or in the possession of a clover. Some believe that the luck is lost if the four-leaf clover is even shown to somebody else, while others think the luck doubles if it is given away. I believe that positivity is increased by sharing. I feel lucky to find the clovers so often, but I don't think they influence my life any more than it does to share anything a little special—that momentary closeness between you and a friend or a stranger, as you all lean in to wonder at a rare find.

    You can relax if remembering everything isn't your strong suit. Recent research makes the case that being forgetful can be a strength—in fact, selective memory can even be a sign of stronger intelligence.

    Traditional research on memory has focused on the advantages of remembering everything. But looking through years of recent memory data, researchers found that the neurobiology of forgetting can be just as important to our decision-making as what our minds choose to remember.

    Making intelligent decisions doesn't mean you need to have all the information at hand. It just means you need to hold onto the most valuable information. And that means clearing up space in your memory palace for the most up-to-date information on clients and situations. Our brains do this by creating new neurons(神经元）in our  hippocampus, which have the power to overwrite(重写)existing memories that are influencing our decision-making.

    If you want to increase the number of new neurons in our brain's learning region, try exercising. Some aerobic exercise like jogging, power walking and swimming has been found to increase the number of neurons making important connections in our brains.

    When we forget the names of certain clients or details about old jobs，the brain is making a choice that these details don't matter. Although too much forgetfulness can be a cause for concern, the occasional lost detail can be a sign of a perfectly healthy memory system. The researchers found that our brains facilitate decision-making by stopping us from focusing too much on unimportant past details. Instead，the brain helps us remember the most important part of a conversation.

    We can get blamed for being absent-minded when we forget past events in perfect detail. These findings show us that total recall(记忆)can be overvalued. Our brains are working smarter when they aim to remember the right stories, not every story.

    As I stuck in the mud (泥), with my bike on top of me, I wondered what had forced me to come here. Madagascar is not a good place for a cycling holiday: one of the world's poorest countries, only 11 percent of roadway is paved (铺). South of the town of Antalaha, where I started, the road was in worse condition.

    I appeared from a week in the wilderness and reached the start of the Route National 5 at Maroantsetra, but my dream of a smooth road and speed was suddenly destroyed by mud. The "worst road in the country" changed my bicycle into a burden (负担) for days. Finally, I was claimed by the road. Tired. Alone.

    As I wiped (擦) the mud from my face and looked upwards, I was greeted by a Malagasy man. He helped me stand up and smiled playfully while he pointed to my bike, which sat next to his. I started again. But I fell again in the mud. Angrily, I told him to go on, but if he understood he showed no sign of it. His smile forced me back onto the bike. We continued like this for hours. But I fell less. Studying my quick guide, slowly I learned. As we passed through a village, a group of children saw me and shouted loudly. His only words were: "Their parents tell them while people steal and eat them. Funny, no?"

    I tried to ask why, but he had already set off. I tried to catch up; as I got closer, he took it as a challenge and sped up. We raced along the road. I rode a little faster and I was just behind, about to catch up with him. With a smile, he sped up and was away, leaving me breathless.

Instagram(图片分享社交应用程序)is about to take its biggest step toward removing likes from its platform. After months of testing an option to hide likes in select international markets, Instagram, which is owned by Facebook(FB), has already been testing hiding likes in seven other countries, including Canada, Ireland and Australia. For years, likes have been central to how celebrities, brands, politicians and everyday users experience Instagram and Facebook. It's a way of measuring popularity(名气) and success. But in recent months, Instagram has been rethinking how likes contribute to making its platform more toxic. Now it's considering a change.

The total number of likes on posts — which appear as hearts on the app—will disappear from Instagram's main feed, profile pages and permalink(永久链接)pages. The owner of the account can still see their own likes, but their followers won't know the count.

CNN Business previously spoke with users in countries with the test. The majority felt this move would improve well-being on the app. Instagram is the most harmful social networking app for young people's mental health, such as negatively influencing body image, according to one study.

But other users and psychologists said hiding likes won't fix everything. The test doesn't address some of the key ways that activity on Instagram can influence the well-being of users, including bullying(欺凌), feeling left out and thinking other people's lives are better than their own.

Renee Engeln, a psychology professor at Northwestern University, voiced his opinion that the biggest impact of Instagram is the content and the exposure to this constant stream of perfected images is what seems to hurt psychologically. Plus, users can still see their own likes—and feel badly if their posts don't perform well.