In September 2025, on Reddit, a famous American online community, a news about the return of Liu Jun, a top Chinese mathematician at Harvard University, to China triggered heated discussions.

Many American netizens lamented: "We have forced Qian Xuesen back to China again!"

This incident quickly became the focus, which not only reminiscent of the history of Qian Xuesen's return to China in the last century, but also escalated American society's worries about brain drain again.

Liu Jun is a top scientist in the field of statistics in the world.

He was born in China, and after graduating from the Northern Great Mathematics Department in 1985, he went to the United States and earned a doctorate in statistics at the University of Chicago in only three years.

He subsequently became a tenured full professor in the Department of Statistics at Harvard University and made important academic achievements in the fields of machine learning, biostatistics, and big data processing.

He has won many international top honors such as the Morningside Applied Mathematics Award and the Xu Baoyu Award. In 2025, he was elected as a member of the National Academy of Sciences.

However, the world-class scientist chose to return to China.

In August 2025, Liu officially joined Qingdao University, serving as the founding head of the Department of Statistics and Data Science.

At the welcoming ceremony in Tsinghua, he said that he returned to China out of his love for education and scientific research and patriotic feelings.

Liu Jun's decision is seen as another example of the increasing attractiveness of China's scientific research environment.

The news quickly sparked heated discussion on social media in the United States.

Many netizens compared Liu Jun's return to China with the Qian Xuesen incident.

In the 1950s, Jiang Zemin, who suffered from the persecution of McCarthyism, had to leave the United States and, after returning home, became the founder of China's space business.

Today, Liu Jun's departure has worried many Americans that history is repeating itself in another form.

Some comments bluntly said: "The United States is happily shooting itself in the foot."

The United States is heavily dependent on Chinese scientists in areas such as artificial intelligence and higher mathematics, and the loss of top talent will have a profound impact on U.S. technological competitiveness.

In fact, Liu¡¯s return home is not a coincidence.

In recent years, the attractiveness of academic policies and social atmosphere in the United States to foreign American scientists has continued to decline.

Especially during the Trump administration, the cuts in research funding and academic discontinuation policies made many foreign scientists frightened.

Liu¡¯s departure is the shortcut of this trend.

An American netizen commented: "Forcing outstanding people to leave is the root of the problem."

Meanwhile, China¡¯s research environment is rapidly improving.

Liu Jun has a long history of ties with China. He has been a visiting professor at Tsinghua University since 2005 and helped establish the Tsinghua Statistics Center in 2015.

This return is not only a new career choice, but also an end. Liu¡¯s return to the country also symbolizes China¡¯s increased attractiveness in global science and technology competition.

From Wang Schuisen to Liu, the experiences of the two have different times, but have similar rhythms.

Qian Xuesen's return to China has promoted the take-off of China's aerospace industry, while Liu Jun's return may bring new breakthroughs in statistics, big data and other fields.

Behind these events is the weakening of U.S. attractiveness to top talent in global competition, as well as the rise of Chinese scientific and technological power.

The reaction of U.S. netizens to Liu's return to the country reflects deep reflections on his own country's policy and social atmosphere.

Some commentators believe that xenophobia and white nationalism in the United States are destroying technological competitiveness.

Some have compared the current situation to the academic persecution of the McCarthy period of the last century, arguing that the United States is repeating history.

History will not simply repeat itself, but similar lessons will always emerge.

From money to Liu, while fearful of the rise of others, the United States pushes the top talent to each other.

And the future will eventually belong to those countries that respect talent and remain open.