I was playing in my kitchen. My mom stood in front of me, hardly keeping the tears from spilling over. She told me that my little cousin had cancer. Hearing this, I went completely numb. How could this be happening? I had just seen her, and she was fine.

    These things didn't happen to our family, that's what my uncle said. It seemed like the world turned upside down; just last week my grandmother had passed away. I felt like I couldn't get my feet on solid ground.

    That's when my sister, Ella, came down the stairs with her long brown hair freshly washed. She sat next to me and smiled. Despite what was happening, everything would work out, her smile seemed to say.

    “Mom, do you think I could get my hair cut tomorrow?” Ella asked.

    “Sure,” Mom said, starting to wash the dishes.

    “I want to donate it to Locks of Love” Ella smiled.

    My mom stopped washing and turned to look at her. “Are you sure?” I noticed that Mom was holding back tears. This was a sacrifice(牺牲) for Ella. Her long hair was an important part of her.

    “Yeah, it's just hair. Eventually it will grow back.” She said.

    “All right,” Mom said quietly, smiling again.

    Ella gave up a part of herself for a while. She let a piece of herself go to someone else, someone she didn't know. That day she became my hero too.

    Our first winter in Canada was the happiest we have ever experienced. We were living in the countryside then and had just arrived from Hong Kong that autumn. One evening in mid-December snow began to fall. When we looked out of the window and saw that it was snowing, we all cheered. It was the first snow we had ever seen and we were excited. We could hardly wait for the snow to stop so that we could go out to play. Next morning when we woke up, it was still snowing. We switched on the radio and learned that more than ten inches of snow had fallen during the night and that since the roads were blocked, there would be no school that day. We jumped up and down for joy and beg mother to let us go outside to play in the snow. She said we could go out after breakfast if we dressed warmly and promised to come back as soon as we felt cold. When we went out, the snow had almost stopped. The roads, paths, gardens, and playgrounds were all hidden under a white blanket of soft snow. It was the most beautiful sight we had ever seen. Just then, we saw some neighbors' children coming out to play. We ran over to join them. Together we built a snowman and a snow house. After that, we took turns sliding down a hill on a large piece of carboard. We were having so much fun when supper time came. Mother almost had to force us to go in and eat.

    Lions are the top tourist attraction to Kenya and also considered critically endangered. One of the main causes of their death is that people kill them in return for lions attacking their cows. “We put our cows in a small cow shelter at night,” locals said, “and that's when the trouble would start. Lions would jump in the shelter and kill the cows”.

    There have been a lot of efforts to try to protect the lions, but it's a crisis and everyone is looking for a solution. One idea was land leases(租用), another was lion-proof fences. However, no one even knew that Richard Turere, a 13-year-old Maasai from Kenya, had already come up with something that worked.

    One night Richard was walking around with a flashlight and discovered the lions were scared of a moving light. An idea was born. Three weeks and much repairing later, Richard invented a system of lights that flash around the cow shelter, mimicking a human walking around with a flashlight. His system is made from broken flashlight parts and an indicator box from a motorcycle. “The only thing I bought was a solar panel（电池板）, which charges a battery that supplies power to the lights at night.” Richard says. He calls the system Lion Lights.

    His simple solution was so successful: his neighbors heard about it and wanted Lion Lights, too. He put in the lights for them. From there, the lights spread and are now being used all around Kenya. Someone in India is trying them out for tigers. In Zambia and Tanzania they're being used as well.

    Spending money on time-saving services reduces stress and boosts(增进）happiness, according to a new research, but shockingly, few of us do it.

    Whillans, a professor at HBS said, "Buying time helps to protect us from the stress in our lives caused by time pressure, and the feeling that we don't have enough minutes in the day to complete our tasks."

    The effect was clearest in the Canadian experiment, in which 60 working adults were given $40 to spend in two different ways. One weekend, they were told to spend the money on a material purchase—a gift for themselves. The next weekend, they were instructed to spend the $40 on anything that saved them time, from paying the neighbor ' s kid to run errands (跑腿）to taking an Uber instead of a bus.

    〇n the day they made the time-saving purchase, they felt happier, in a better mood, and lower feelings of time stress than on the day they bought a material purchase," said Whillans.

    The biggest surprise to the researchers was how few people would spend money on time-saving services. When they asked 98 working adults how they would spend a "windfall" of $40, only two percent named a purchase that would save them time.

    "One reason," said Whillans, is that we're very bad at remembering how much we hate doing certain tasks once the suffering has passed. That makes us less likely to take active steps to avoid that overburdened feeling in the future. "But another possible cause is good old-fashioned guilt." If you feel guilty about getting someone to clean your house for you, then you might get less happiness from outsourcing (夕卜包）that task," said Whillans, "or you might just be less likely to spend your money in that way."

    At 1,345 meters above sea level, Ben Nevis is not the world's most difficult mountain to climb. But things get considerably tricky if instead of hiking shoes you put on a pair of 5-inch high heels, especially if you're a guy. One English teenager recently proved that it was not impossible.

    Ben Conway, a 19-year-old art student from London, recently took up the challenge as a way to stand out in an application for a scholarship for the School of Communication Arts in Brixton. He started his unusual high-heel climb at 8 a.m., on June 27, and was joined by Callum MacKenzie Allen, a friend from his art foundation year, who videotaped the whole thing for a two-minute video that was used as his application project. The whole climb took five hours and wasn't the smoothest experience.

    Halfway up Ben Nevis, one of his shoes broke, so he had to tape the shoes to his feet to make sure they stayed on. The weather didn't make it easy for him either, as he claimed that it rained pretty much the whole time, and he had to go against 40 to 50 miles an hour winds. Due to these difficult conditions, Ben and his friend had to turn back after reaching 900 meters up the mountain.

    Besides providing a unique art school application project, the high-heel climb also allowed the 19-year-old to raise some money for worthy causes (事业), like Sal's Shoes, which provides footwear for barefoot children around the world.

    "Raising money for charity brings happiness to people's lives and if I can do something ridiculous and bring someone happiness, then that's what it's all about." Ben said.

Researchers in Australia recently announced a new device（设备） that absorbs water from air to produce drinkable water. They said it can produce up to 1,000 liters of drinkable water a day, adding that it could be "lifesaving during drought or emergencies". What's more, unlike other water generators（造水机）, their invention works by heating air instead of cooling it.

Researchers at the University of Newcastle call the device the Hydro Harvester. The device absorbs water from the air. Solar energy or heat from other industrial processes can be used to produce hot and wet air. After heating, the air cools, producing water for drinking or watering crops.

The researchers say the device can produce enough drinking water each day for a small rural town of up to 400 people. It could also help farmers keep their crops alive during droughts. Researchers thought their device would be especially useful in Australia because its climate is dry.

More than 2 billion people around the world will benefit from the device. They are in a situation where they do not have access to high-quality water. The device is meant to help alleviatewater shortage and safety.

Studies of the technology will be done in several Australian communities this year. The World Economic Forum （WEF）, a nonprofit group based in Switzerland, says water shortage continues to be a problem worldwide. The WEF said getting water from the atmosphere is a "promising solution that can immediately generate drinkable water using moisture（水汽） in the air". However, the group warns that the technology is costly. It estimates that one mid-sized device could cost between $ 30,000 and $ 50,000. So the group is concerned whether it will be accepted by the public.