It was not uncommon to see a person like me in an amusement park, who held purses, cellphones and sunglasses while others enjoyed themselves riding roller coasters. I admitted their courage, but refused to challenge myself.

One day when we were at the Happy Amusement Park in Seattle, my friends tried to get me to ride a roller coaster. But the click, click, click of the cars climbing up the tracks made me scared. The stop at the top, before falling with people's screams, seemed terrible.

My friends were still trying to persuade me, and I was saying no as usual, when I suddenly saw a familiar face, one I had never seen in real life. It was Raine, a popular young tennis star at the top of her game, who was my heroine. I pulled out a pen and the only paper that I could find and walked to her.

She was making her way through a rope that led to a ride called the Loudest Scream. I was running fast because I didn't want to miss the chance to meet her face to face, but I was also a bit nervous. So I waited at the exit to calm down and get closer to her as she came off the ride.

Several minutes later, she got out from the exit, laughing and talking with her brother. I focused on her walking toward me. She walked past. It was more difficult to talk to a star than I thought, but I had to take the chance. I called her name, not very confidently, but more like a question, “Raine?” She turned around. Our eyes actually met. “Would you mind signing for me?” I asked, handing the pen and paper toward her. Her hand wrote over the paper and she said, “You are the first person who has recognized me in the park so let's take a roller coaster together.”

Her warm invitation actually filled me with mixed feelings.

My friend came up and asked, “Are you sure you will take the Loudest Scream?”

Early one weekend morning, I was sleeping like a log when the telephone rang. When I answered I heard my Grandma’s voice “Hey, sweetheart. I have missed you so much lately. Why don’t you come to the countryside and enjoy some fine views?” she asked. “Dad, Grandma is inviting us to her home,” I shouted to my father who was busy in the kitchen. “Fine with me,” he responded in a casual tone. After a quick breakfast, we drove to Grandma’s.

Once we arrived, we were both thrilled by the breathtaking landscape. The plum trees in the backyard were ripe with fruit, while millions of wildflowers colored the valley. Grandma prepared delicious lunch including her special homemade apple jam, which was my favorite. Seeing my greedy eyes, grandma said “Take some when you leave, and I’ve got plenty stored in the cellar (地窖) .” Talking and laughing, we didn’t even notice that it was late in the afternoon, though somewhat cooler than it had been that morning. Grandma suggested that we take her homemade wooden boat for a tour along the nearby river.

Seated in the boat, looking up at the sky, I felt like the clouds were greeting us cheerfully from above. In the vast fields, the golden trees were like brides in the sun. The breeze skimmed over the surface of the field, carrying the sweet smell of the flowers. It was like a picture painted by one of the Dutch masters. “It is so nice to spend some quality time with family,” Dad murmured. “It feels like we’re on an adventure,” I added. “It’s been so much fun!”

While we were admiring the splendid setting around us, the weather started getting hot and humid again. At first, we ignored this change, but when dad looked up at the sky, he saw dark, low clouds were approaching us. Then a fierce gale (大风) sprang up. Lightning flashed within the black clouds, followed by a roar of thunder. “Row!” Dad shouted, trembling, “A tornado (龙卷风) is coming!”

There was no time to think. We rowed as fast as we could.

Grandma opened the door for us.

5 . Oxygen, I'm sure you'd agree, is pretty important for life on Earth. We breathe it in, our cells survive on it and without it, we hardly live. Basically all multicellular life on Earth evolved over millions of years to make use of oxygen.

But take a deep breath, because we need to talk about Henneguya salminicola, a tiny parasite(寄生虫) containing fewer than100 cells that lives within the muscle tissue of salmon, a large fish with silver skin and pink flesh. The strange-looking parasite does not busy itself with such small matters as breathing oxygen. Nope, it seems that H. salminicola is the first multicellular animal we've found that survives without the stuff.

“Aerobic respiration(有氧呼吸) was thought to be commonly found in animals, but now we confirmed that this is not the case, "said Dorothee Huchon, a zoologist at Tel Aviv University in Israel, in a press release.

Huchon and a team of international researchers examined and sequenced(排序) all of. salminicola's' genes in their study, published in the journal Proceedings of the National Academy of Sciences. They found that the parasite, which is closely related to jellyfish, lacks the DNA machinery necessary to“breathe”---it doesn't' have mitochondria(线粒体), often called the "powerhouse" of the cell, because they use oxygen to make energy. It's like a little factory inside almost all cells, and DNA detectives can find mitochondrial genes during sequencing.

The discovery came as something of an accident for the team, who were examining the genome (the complete set of genes) of the species. When they went searching for the mitochondrial genes,   they came up empty-handed. "Our discovery shows that evolution can go in strange directions, ”Huchon said. "Aerobic respiration is a major source of energy, and yet we found an animal that gave up this important pathway.”

Some single-celled life forms have evolved the ability to survive without oxygen and do not have mitochondria, either. Plenty of bacteria can exist without oxygen at all. Instead of oxygen, they get their energy from fermentation(发酵) or use other molecules like iron.

But how H. salminicola produces energy is still unclear. Huchon suggests it could draw oxygen from the cells in salmon or it could have evolved similar methods to those of single-celled organisms which scientists have documented in the past.

6 . Great work is work that makes a difference in people’s lives, writes David Sturt, Executive Vice President of the O.C. Tanner Institute, in his book Great Work: How to Make a Difference People Love. Sturt insists, however, that great work is not just for surgeons or special-needs educators or the founders of organizations trying to eliminate poverty in sub-Saharan Africa. The central theme of Great Work, according to Sturt, is that anyone can make a difference in any job. It’s not the nature of the job, but what you do with the job that counts. As proof, Sturt tells the story of a remarkable hospital cleaner named Moses.

In a building filled with doctors and nurses doing great life-saving work, Moses the cleaner makes a difference. Whenever he enters a room, especially a room with a sick child, he engages both patients and parents with his optimism and calm, introducing himself to the child and, Sturt writes, speaking “little comments about light and sunshine and making things clean.” He comments on any progress he sees day by day (“you’re sitting up today, that’s good.”) Moses is no doctor and doesn’t pretend to be, but he has witnessed hundreds of sick children recovering from painful surgery, and parents take comfort from his encouraging words. For Matt and Mindi, whose son McKay was born with only half of a heart, Moses became a close friend. As Sturt explains, “Moses took his innate (与生俱来的) talents (his sensitivity) and his practical wisdom (from years of hospital experience) and combined them into a powerful form of patient and family support that changed the critical-care experience for Mindi, Matt and little McKay.”

How do people like Moses do great work when so many people just work? That was the central question raised by Sturt and his team at the O.C. Tanner Institute, a consulting company specialized in employee recognition and rewards system.

O.C. Tanner launched an exhaustive Great Work study that included surveys to 200 senior executives, a further set of surveys to 1,000 managers and employees working on projects, an in-depth qualitative study of 1.7 million accounts of award-winning work (in the form of nominations (提名) for awards from corporations around the world), and one-on-one interviews with 200 difference makers. The results of the study revealed that those who do great work refuse to be defeated by the constraints of their jobs and are especially able to reframe their jobs: they don’t view their jobs as a list of tasks and responsibilities but see their jobs as opportunities to make a difference. No matter, as Moses so ably exemplifies (例证), what that job may be.