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Zhao is 17.

Centuries after it led the world in technological prowess -- think gunpowder, irrigation and the printed word -- China has barged back into the ranks of the great powers in science. With the brashness of a teenager, in some cases literally, China's scientists and inventors are driving a resurgence in potentially world-changing research.

Unburdened by social and legal constraints common in the West, China's trailblazing scientists are also pushing the limits of ethics and principle as they create a new -- and to many, worrisome -- Wild West in the Far East.

A decade ago, no one considered China a scientific competitor. Its best and brightest agreed and fled China in a massive brain drain to university research labs at Harvard, Stanford and MIT.

But over the past five years, Western-educated scientists and gutsy entrepreneurs have conducted a rearguard action, battling China's hidebound bureaucracy to establish research institutes and companies. Those have lured home scores of Western-trained Chinese researchers dedicated to transforming the People's Republic of China into a scientific superpower.

"They have grown so fast and so suddenly that people are still skeptical," said Rasmus Nielsen, a geneticist at the University of California at Berkeley who collaborates with Chinese counterparts. "But we should get used to it. There is competition from China now, and it's really quite drastic how things have changed."

China has invested billions in improving its scientific standing. Almost every Chinese ministry has some sort of program to win a technological edge in everything from missiles to medicine. Beijing's minister of science and technology, Wan Gang, will visit the United States in early July and is expected to showcase some of China's successes.

In May, for example, a supercomputer produced in China was ranked the world's second-fastest machine at an international conference in Germany. China is now in fourth place, tied with Germany, in terms of the number of supercomputers. China has jumped to second place -- up from 14th in 1995 -- behind the United States in the number of research articles published in scientific and technical journals worldwide.

Backed by the Bill and Melinda Gates Foundation, Chinese medical researchers, partnering with a firm in the United States, beat out an Indian team last year to develop a new test for cervical cancer that costs less than $5. The goal is to test 10 million Chinese women within three years.

Chinese engineers have significantly improved on Western and Soviet coal-gasification technology as part of a multibillion-dollar effort to create green Chinese energy.

Action, not research

"The action is here," said S. Ming Sung, the chief Asia-Pacific representative for the Clean Air Task Force, a U.S.-based nonprofit entity, and a former Shell Oil executive. "In the U.S., there are too many paper researchers. Here, they are doing things."