Yanwen’s blog

10/27/2026

Yesterday, I read about the remarkable journey of Cai Zheng (蔡峥), a 40-year-old associate professor and vice chair of the Department of Astronomy at Tsinghua University. He is leading an ambitious project to build a powerful new telescope in western China.

The project is called MUST, short for the MUltiplexed Survey Telescope. I do not understand all the technical details, but what impressed me was the scale of the undertaking and the determination of the scientist behind it.

MUST is designed to do something special: observe a large area of the sky and collect detailed information about thousands of celestial objects at the same time. Unlike an ordinary camera, which mainly records how an object looks, a spectroscopic telescope also analyzes the light coming from it. This light can reveal information about an object's composition, movement, and distance.

In simple terms, MUST will help astronomers map the universe in much greater detail and investigate some of its biggest mysteries, including dark matter, dark energy, and how galaxies form and evolve. With a 6.5-meter primary mirror and thousands of optical fibers to collect light from different objects simultaneously, it is designed to survey the sky far more efficiently than existing facilities of its kind. Its first light—the moment it begins making astronomical observations—is planned for around 2029.

Once built, MUST marks China’s leap into leading large spectroscopic survey in the world. It will bring China into the front rank for this kind of cosmic mapping.

The telescope is being built at Lenghu, in Qinghai Province, on Saishiteng Mountain, at an elevation of about 4,576 meters. The site offers exceptionally dry, dark skies and stable atmospheric conditions, which are important for observing distant objects. But the same remote, high-altitude environment also makes construction and testing difficult.

The engineering challenges are beyond imagination. The project requires a giant, precisely shaped mirror, a sophisticated optical system, thousands of light-collecting fibers, and machinery capable of tracking celestial objects with extraordinary accuracy. Astronomers, engineers, and specialists from different fields must work together to make all these components function as one system.

The financial and professional risks are equally daunting. Cai has said that the project would cost more than one billion yuan and that, at the beginning, some experts doubted it could succeed. For a young academic, leading such a complex, long-term project is very different from conducting research and publishing papers. It requires not only scientific knowledge but also the ability to raise funds, build a team, coordinate different disciplines, and keep going when the outcome remains uncertain.

What touched me most was Cai's reflection on belief. He said, in essence, that from very beginning we must believe it can be done, work hard toward it, and persist in doing what is difficult but worthwhile.

“ 你必须相信这件事能办成.” (Nǐ bìxū xiāngxìn zhè jiàn shì néng bàn chéng.) You have to believe that you can make it happen.

I find this meaningful and inspiring far beyond science. Whether we are pursuing a career, raising children, learning a new skill, or working toward a long-term goal, we often face doubts—from others and from ourselves. Belief means believing that the goal is worth pursuing and that, through effort and persistence, success will become possible.

10/26/2026

Yesterday, I came across a quotation from Walter Lippmann, the renowned American journalist and political commentator:

The quotation appeared in Lippmann’s essay “Roosevelt Is Gone,” written shortly after the death of U.S. President Franklin D. Roosevelt. Lippmann’s point was that a truly great leader does not make himself indispensable. Rather than leaving behind a fragile system that depends on his continued presence, he stabilizes crises, builds durable institutions, and enables others to carry on successfully.

In other words, good leadership fosters independence rather than dependency. It builds for the long term rather than relying on one extraordinary individual.

This idea made me think about parenting and the Chinese saying “富不过三代” (Fù bú guò sān dài), often translated as “Wealth rarely lasts beyond three generations.” Perhaps one reason family fortunes are difficult to sustain is that passing down wealth is not the same as passing down the judgment, discipline, and abilities needed to manage it.

Good parents, like good leaders, do not need to be constantly present to solve every problem their children encounter. Their goal should be to prepare their children to handle challenges independently.

This means helping children develop good habits, sound judgment, problem-solving skills, and self-discipline. It also means creating routines and clear expectations that help them manage their responsibilities without constant reminders.

For example, instead of immediately intervening whenever siblings argue, parents can teach them a simple process for listening to each other, explaining their feelings, and working toward a solution. With practice, the children can use the same approach when their parents are not around.

Similarly, instead of reminding children every night to pack their schoolbags, parents can help them establish a checklist and a designated place for their school supplies. Eventually, the routine becomes a habit, requiring less parental supervision.

The goal is to build a structure that works even when parents are busy, tired, or away.

In the long run, the greatest gift a parent can give a child is the ability to stand on their own two feet.

10/25/2026

While reading Kenneth Barish’s book on parenting and grandparenting, I kept thinking back to my own upbringing. I have long believed that good parenting can make a profound difference in a person’s life.

I spent my adolescent years during the tumultuous decade of China’s Cultural Revolution (文化大革命, Wénhuà Dà Gémìng, 1966–1976).

During that period, young people, especially students organized into groups known as the Red Guards (红卫兵, Hóng Wèi Bīng), were encouraged to challenge established authority, including teachers, school administrators, intellectuals, and Party officials. In the name of revolution, many participated in persecution, humiliation, violence, and the destruction of cultural heritage. The slogan “革命无罪，造反有理” (Gémìng wú zuì, zàofǎn yǒu lǐ)—“Revolution is no crime; rebellion is justified”—captured the spirit of the time.

Looking back, it is hard to believe how society departed so far from normal life and basic human decency. Yet I was too young to understand the larger political forces at work. What saddens me most is that my parents, too, were caught up in the revolutionary fervor.

At school, becoming a Red Guard was considered a sign of being politically progressive. What I remember most vividly—and still feel uncomfortable about—is the pressure I faced to join the Red Guard. Both my parents had joined the Chinese Communist Party when they were young, so they could not understand why I was not eager to demonstrate my political commitment. I remember feeling so burdened by this issue that I sometimes tried to avoid them, afraid they would bring up the topic.

Joining the Red Guards was not as simple as expressing a desire to do so. I had to write self-criticism reports for class leaders, have what were called “heart-to-heart talks” with them, cultivate good relationships with those in charge, and perform good deeds to demonstrate my political attitude. Most difficult of all, I felt I would have to do many things against my own wishes. I think I was a rebel at heart. I resisted doing many of the things I was expected to do.

Yet I could not bring myself to explain all this to my parents, especially my father, who believed I should be humble enough to approach the class leaders and win their approval. I felt caught between my parents’ expectations and who I really was.

Looking back, I think my adolescent years would have been happier if my parents had been able to see beyond the temporary revolutionary fervor and recognize how difficult that period was for me. I wish they had recognized that the Red Guard movement was part of an extraordinary and deeply turbulent political upheaval, rather than a test of whether a young person was progressive.

This brings me back to the subject of parenting. I believe parental wisdom matters enormously. Parents do not have to be right about everything, but they need the wisdom to make wise judgment and to distinguish lasting values from temporary social pressures. They should guide their children without demanding unquestioning conformity, and listen carefully when their children’s instincts differ from their own.

My parents were products of their time, just as I was. I am not blaming them here. Rather, I want my children to understand that good parenting requires not only the courage to guide children, but also the wisdom to think independently and the humility to listen to them. Sometimes, the greatest gift parents can give their children is the freedom to follow their own conscience.

10/24/2026

I’m continuing my discussion of Kenneth Barish’s 2026 book, The Art and Science of Parenting and Grandparenting, which explores the role grandparents can play in children’s emotional development.

10/23/2026