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With the completion of the Human Genome（基因组）Project more than 20 years ago, and the discovery of the double helix structure of DNA enjoying its 70th birthday last year, you might assume that we know how life works. Think again!

Evolution has a 4bn-year head start on us. However, several aspects of the standard picture of how life works-the idea of the genome as a blueprint, of genes as instructions for building an organism, of proteins as precisely tailored molecular（分子）machines and more-have wildly reduced the complexity of life. 

In the excellent book How Life Works, Philip Ball explorers the new biology, revealing life to be a far richer, more delicate affair than we have understood. Ball explains that life is a system of many levels-genes, proteins, cells, tissues, and body modules-each with its own rules and principles, so there is no unique place to look for an answer to it. 

Also, How Life Works is a much more appealing title than the overused question of "What is life?". We should be less concerned with what a thing is, and rather more focused on what a thing does. Defining a living thing implies an unchangeable ideal type, but this will run counter to the Darwinian principle that living things are four-dimensional, ever changing in time as well as space.

But it's an idea that is deeply rooted within our culture. Ball points out that we rely on metaphors（比喻）to explain and explore the complexities of life, but none suffice. We are taught that cells are machines, though no machine we have invented behaves like the simplest cell; that DNA is a code or a blueprint, though it is neither; that the brain is a computer, though no computer behaves like a brain at all.

Ball is a terrific writer, pumping out books on incredibly diverse subjects. There's a wealth of well-researched information in here, and some details that are a bit chewy for the lay reader. But the book serves as an essential introduction on our never-ending quest to understand life.

Earlier this year Rodney Smith Jr. made headlines when he drove eight hours from his home in Huntsville. Alabama, to cut the lawn for an elderly soldier in North Carolina who couldn't find anyone to help him with his yard work.

That wasn't the first time the twenty-nine-year-old Bermuda native had gained such attention. To do his good deeds, Rodney often finds leads for those in need through social media.

Back to one August afternoon in 2015, Rodney Smith Jr. was driving home. That's when Rodney saw an elderly man struggling to mow his lawn. He would take a couple of shaky steps, using the handle to stabilize himself, pause, then slowly push the mower again. Rodney decided to help. Mr. Brown thanked him greatly, and Rodney went home feeling satisfied.

Sitting at his computer to do his homework, Rodney couldn't get Mr. Brown out of his mind. There must be many Mr. Browns out there. He went online and posted that he would mow lawns for free for senior citizens. Messages flooded in.

One day a cancer-battling woman said she wasn't having a good day. Rodney decided to do more than mowing lawns. After he finished mowing, he knocked on her door. "You're going to win this fight, Madam", he said. Then he asked folks to pray for her on social media.

Word of Rodney's mission spread. A grandmother in Ohio said he'd encouraged her 12-year-old grandson to mow lawns. He got a letter from a seven-year-old boy in Kansas. "Mr. Rodney, I would like to be a part of your program, and I'll make you proud," he wrote.

That gave Rodney an idea. In 2017, he decided to establish a programme Raising Men Lawn Care Service to make a national movement for young people. The kids learn the joy of giving back.

Yard work seems like a small, simple thing, but taking care of the lawn means a lot to the people they do it for. "When we mow their yards for free, they can use the money for healthcare and food etc. It means more than you would think," Rodney said.

China's taijiquan, also known as tai chi — a major part of the amazing {#blank#}1{#/blank#} (open) ceremony of the 2008 Beijing Olympic Games and represented by numerous practitioners worldwide —{#blank#}2{#/blank#} (add) to UNESCO's Representative List of the Intangible Cultural Heritage of Humanity on Thursday. On its website, UNESCO described the cultural icon as "a traditional physical practice characterized by relaxed, circular movements that can be used {#blank#}3{#/blank#} (adjust) breath besides cultivating an honest and neutral (中性的) mind".

"Their inscription onto the list showed the unique value of intangible cultural heritage on people's health and {#blank#}4{#/blank#} (sustain) development," said Wang Chenyang,{#blank#}5{#/blank#}inspector from the Ministry of Culture and Tourism who is in charge of the work related to intangible cultural heritage.

Taijiquan, {#blank#}6{#/blank#} originated during the mid-17th century in Wenxian county in Jiaozuo, Henan province, is practiced almost {#blank#}7{#/blank#} (day) throughout the country by people of all ages and ethnic groups, according to UNESCO's website. {#blank#}8{#/blank#} (influence) by Taoist and Confucian thought and theories of traditional Chinese medicine, the practice has developed {#blank#}9{#/blank#} several schools or styles named after a family or a master's personal surname, such as Chen style or Yang style.

They are passed down through clan-based transmission or the master-apprentice model, {#blank#}10{#/blank#} built upon the yin and yang cycle and the cultural understanding of the unity of heaven and humanity, UNESCO said.

Year-12 student Noah Little has already sat his first Chinese-speaking exam and said it was "the easiest exam I've ever done". That view is not surprising given that the Wagga Wagga High School student loves language—so much that he has built a Chinese translation app.

Noah said his love of language was encouraged by his community. "Wagga Wagga is a place full of people from different cultures, and sometimes when I meet new people who have trouble speaking English, I like to talk to them in their own language," he said. "I also have a few Chinese friends so I think it will be cool to talk to them in their language."

The 17-year-old started teaching himself Chinese around five years ago, before taking distance education courses at the start of Year 11. His language ability was also useful in his part-time job at a local Chinese restaurant, where he translated orders for the cooks and customers.

Noah said he also had a basic knowledge of seven other languages. It was while teaching himself the languages that Noah got the idea of the translation tool. "I decided to make my own app because there weren't many around—all the other apps were full of advertisements (广告) and the translation feature (专题节目) wasn't powerful enough," he said.

His app also includes a word of the day feature, lessons on how to write Chinese characters (汉字) and a news feed of important Chinese news.

He said learning computer programming to build the app had been like studying another language. With the end of school around the corner, Noah said he would like to pursue (追求) both his interest in computer programming and languages. "I'm planning to work for a year and save so I can go on to university as I really want to make a career (事业) out of one of these two topics."

In 2014, Amy collapsed from a brain hemorrhage (脑溢血) while working. After a year recovering at home, she 1 a course with the ambition to become a 2 .

However, occasional vision disturbance was still 3 , influencing the amount of 4 she could give to the course. Further complications (并发症) left the young artist almost completely blind, making it difficult to see a whole figure. It's particularly 5 because it seemed to 6 her optimism to be a painter! 

One morning, when watching the sunrise, she suddenly felt a sense of 7 . She realized that she may not 8 a whole face anymore, but it shouldn't stop her from putting what she could see on canvas (画布). The following years, she 9 her special art journey.

"Strangely, my experience has increased my 10 when drawing, enabling me to catch a character better," she explains. "People often speak highly of the detail and sensitivity of the character. I have more determination and appreciation for my 11 . These are 12 I wouldn't have had without everything I've 13 ." For her new touring exhibition, she has produced a series of artworks based on her visual experience. "In the 14 interaction between what I can and cannot see lies my perspective on the world."

Sometimes, we can turn a loss into a gain: something unique and individual that has been gifted to us by never 15 .