It was an autumn morning shortly after my husband and I moved into our first house. Our children were upstairs unpacking，and I was looking out of the window at my father moving around mysteriously on the front lawn. “What are you doing out there?” I called to him.

    He looked up, smiling. “I'm making you a surprise.” I thought it could be just about anything. When we were kids, he always created something surprising for us. Today, however, Dad would say no more, and caught up in the busyness of our new life , I eventually forgot about his surprise.

    Until one gloomy day the next March when I glanced out of the window，I saw a dot of blue across the yard. I headed outside for a closer look. They were crocuses (番红花）throughout the front lawn — blue, yellow and my favorite pink，with little faces moving up and down in the cold wind. I remembered the things Dad secretly planted last autumn. He knew how the darkness and dullness of winter always got me down. What could have been more perfectly timely to my needs?

    My father's crocuses bloomed each spring for the next five seasons, always bringing the same assurance: Hard times are almost over. Hold on, keep going, and light is coming soon.

    Then a spring came with the usual blooms but the next spring there were none. I missed the crocuses, so I would ask Dad to come over and plant new bulbs (植物球茎). But I never did. He died suddenly one October day. My family were in deep sorrow, leaning on our faith.

    On a spring afternoon four years later, I was driving back when I felt depressed. It was Dad's birthday, and I found myself thinking about him. This was not unusual — my family often talked about him, remembering how he lived up to his faith. Suddenly I slowed as I turned into our driveway. I stopped and stared at the lawn. There on the muddy grass with small piles of melting snow, bravely waving in the wind, was one pink crocus.

    How could a flower bloom from a bulb more than 18 years ago, one that hadn't bloomed in over a decade? But there was the crocus. Tears filled my eyes as I realized its significance.

    Hold on, keep going, and light is coming soon. The pink crocus bloomed for only a day, but it built my faith for a lifetime.

    What are American high schools like? Well, I'm happy to tell you what I know.

    When I started school here, it had already been a week since the school opened. At this school, freshmen usually go on a trip for about three days at the beginning of school. Unfortunately I missed that wonderful trip, which would have been the best time to get to know my classmates. I was really sad. I wished I'd known about it earlier.

    Despite the disappointment, however, I gradually adapted to my new life and school.

    There is a space in the basement of the teaching building where students chat and meet each other. As we do not always have the same classrooms and classmates, the school wants us to get to know each other there. Students usually come to school early, sit in that space and have fun. Around the space, there are many lockers for students to leave their books in, so that students do not have to carry a heavy schoolbag everywhere.

    It really surprises me that we have almost no textbooks. We only have textbooks for World History and Algebra 2 and they are big and heavy, like bricks. For other classes, we only need binders (活页夹) with paper in them. Without textbooks, students learn things freely and actively. For example, my humanities teacher just teaches us what is in her mind at the time. We never know what we will learn.

    Another difference between American schools and Chinese schools is that American schools care about students' morality more than their academic studies. For example, if you do not finish your homework, you will just be asked to do it later, but if you cheat or lie, you will get a warning or even be kicked out.

    I think that most students here are good at schoolwork as well, but compared to Chinese students, they can make learning a more joyful experience. I think we should take the good points from our two different kinds of education to perfect our approach to studying.

    More students than ever before are taking a gap year（间隔年） before going to university. It used to be the "year off" between school and university. The gap﹣year phenomenon originated（起源） with the months left over to Oxbridge applicants between entrance exams in November and the start of the next academic year.

    This year, 25310 students who have accepted places in higher education institutions have put off their entry until next year, according to statistics on university entrance provided by the University and College Admissions Service （UCAS）.

    That is a record 14.7% increase in the number of students taking a gap year. Tony Higgins from UCAS said that the statistics are good news for everyone in higher education. "Students who take a well﹣planned year out are more likely to be satisfied with, and complete, their chosen course. Students who take a gap year are often more mature and responsible, "he said.

    But not everyone is happy. Owain James, the president of the National Union of Students （NUS）, argued that the increase is evidence of student hardship﹣young people are being forced into earning money before finishing their education. "New students are now aware that they are likely to leave university up to￡15, 000 in debt. It is not surprising that more and more students are taking a gap year to earn money to support their study for the degree. NUS statistics show that over 40% of students are forced to work during term time and the figure increases to 90% during vacation periods," he said.

    Alongside air and water, food is a necessity for human beings to survive and thrive. But it's a lot more than that. As Mariette Dichristina of Scientific American wrote: "The most intimate (亲密的) relationship we will ever have is not with any fellow human being. Instead, it is between our bodies and our food."

    Nowadays, for most people in the world's wealthiest countries, food is a hobby, an enthusiasm, and even something fashionable.

    Turn on the TV in the US, UK or France, and you'll find at least one channel feeding this popular obsession.

    And most of us know at least one person who thinks of themselves as a "foodie". It's almost impossible nowadays to check our social media apps without at least two or three photos of delicious meals appearing on our screen.

But behind the fancy recipes and social media bragging (夸耀), many of us forget how much we take food for granted. This is why World Food Day is held each year.

    Take Kenya for example. This east African nation has been suffering terrible droughts. The result is that people are beginning to starve. Children in particular are suffering, with some of them even dying.

    This may seem shocking to know, especially as many cultures outside of Africa think of food in a completely different way. But even in the UK, families on low incomes are forced to use food banks—European organizations that hand out donated food to those who can't afford to pay for it themselves.

    So what can we do on World Food Day? One good way to spend it would be to feel humble and appreciate what we have. After all, food is essential for survival, but not everyone is as lucky as we are when it comes to dinner time.

    The "Give It Up for Earth Day" encourages people to commit to giving up actions that are harmful to the environment, such as using poisonous cleaners.

    Throughout the month of April, Canadians are being asked to "Give It Up for Earth Day!" Earth Day has been celebrated every year on April 22 since 1970. Earth Day Canada president Jed Goldberg says that as people become more environmentally aware, they want to find ways to reduce their environmental influence, not just celebrate one special event.

    "Earth Day is a great launching pad for thinking about environmental action every day," said Goldberg. "Choosing healthier options, even for the short term, can lead to thinking about the influence of our decisions for a lifetime."

    That's the reason behind the "Give It Up for Earth Day" campaign. It's designed to encourage healthy habits that benefit people and the planet. It challenges everyone to help create a healthier world by making changes in their daily routine.

    "We wanted to plan an action—targeted campaign that will give people a chance to act on their concern for the environment in a positive way," said Goldberg.

    The campaign has identified four daily actions that can add up to huge environmental savings. They include pledging (保证) to turn off the TV, give up the use of poisonous cleaners, reduce consumption of consumer products and cut out meat.

    At the end of April, all of the pledges will be recorded and converted (转化) into the number of TV hours not watched, dollars not spent on unnecessary items, electricity saved, greenhouse gas emissions (排放) avoided by cutting out meat, and poisonous chemicals produced from homes and landfills.

    "What we're trying to achieve this year for Earth Day is to give people a chance to do something that is meaningful and measurable," said Goldberg.

A Norwegian company has created what it calls the world's first zero-emission(排放), autonomous cargo ship(货船). Developed by chemical company Yara International, the ship was designed to reduce emissions of pollutants and greenhouse gases, and move goods away from roads to the sea.

The shipping industry accounts for between 2.5% and 3% of global greenhouse gas emissions, according to the International Maritime Organization. Nearly all of Norway's electricity is generated by hydroelectric power, which is generally considered to have much lower carbon emissions than burning fossil fuels, despite the fact that it still produces greenhouse gases.

Capable of carrying 103 containers and with a top speed of 13 knots, it will use a 7 MWh battery, with about a thousand times the capacity of one electrical car. The ship will be charged near the port before sailing to container harbors along the coast and then back again, replacing 40,000 truck journeys a year.

As well as providing a greener option compared to conventional cargo ships, there is no crewman, which means it will be more cost-effective to operate. Initially, loading and unloading the ship will require humans, but gradually, all loading, discharging, and some other operations will also be eventually operated using autonomous technology. That will involve developing autonomous cranes(起重机) and carriers, which are the vehicles that place containers onto ships.

According to researchers, fully autonomous ships are the future. But there are many challenges to overcome before autonomous ships can be used for commercial long sea journeys. Navigating traffic in large ports could be a major barrier.

Without a crew aboard to carry out maintenance checks, autonomous ships would need built-in self-diagnosing systems with the ability to detect and fix problems, or call for human assistance.

Although Yara International has no plans to add more autonomous ships to its operations, we may see more elements of AI technology used on commercial ships in the future. Elements are already being used in shipping today when it comes to the voyage and we'll see more partly autonomous elements added.