One reason is that for decades China sent its best math students abroad.
China also sends more students abroad than any other country in the world, followed by India and South Korea, respectively.
It is expensive to send students abroad, conduct international research and compete for the best academics in a borderless labour market.
Many are going on to teach in Chinese universities, slowing the brain drain that has long had China sending its smartest students abroad, never to return.
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According to the OECD, the UK is second only to the US as a destination for tertiary students studying abroad (as of 2008, 10% of all students studying in foreign countries were enrolled in UK institutions of higher learning).
Many students work abroad and take years to realize their full earnings potential, she added.
America is easily the favourite destination for students going abroad, followed by Britain, Germany and Denmark.
Big obstacles stopped students nipping abroad for a term, or getting degrees recognised.
Today, with more and more bright students going abroad to university, many Greek parents reckon that the country's state education is worse than ever before.
Without more students from abroad, today's university boom could be short-lived.
Intelligence and security expert Professor Anthony Glees, who published a report last year warning of the risks of students being radicalised, said he believed there should be far more checks on students from abroad.
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The United States attracts the most international students, according to the Institute of International Education, with 691, 000 students studying abroad in the US during the 2009 to 2010 school year.
The students also go abroad for a semester, to Germany, France, or the United States.
These days, record numbers of students are studying abroad all over the world.
Together with a cap on the numbers allowed into British universities, this is encouraging students to look abroad.
In 2001, 28% of students who studied abroad did so at American universities.
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It is especially embarrassing for Mr Simitis, an academic before he went into politics, that many Greek students are moving abroad.
Plus, countries that encourage their students to study abroad usually do so with the hope that they will return and give back to their home economies.
The UNESCO Institute of Statistics calculates that in 2007 almost a quarter of students who studied abroad studied business far more than any other subject.
At least a third of successful PhD students come from abroad.
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On a panel I shared with Dr. Huiyao last year, he said China had sent 100 million students to study abroad over the past 30 years.
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David was also the leading force behind legislation that has encouraged thousands of American college students to study abroad to deepen their knowledge of the world and cultures.
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The other students later went abroad, to Israel or the U.S., leaving Yu with an odd distinction: he's probably the sole Hebrew-speaking college graduate in a country of 1.2 billion people.
For students considering studying abroad, this roundup of advice from higher education experts may provide some guidance.
Cynics will sneer that American universities in developed countries such as Britain or France are either a wheeze allowing American students to transfer abroad to spend a year or two earning credits in cities more pleasant than, say, Peoria or are a way of allowing rich foreign students who fail to gain entry to their own national universities to gain a degree.
For example, Ieng Sary is said to have been personally responsible for summoning back Cambodian students and diplomats from abroad.
For the students themselves, studying abroad can present opportunities for learning new languages, travelling, career development, experiencing new cultures and forming new friendships.
They were citizens of 21 nations, among them students returning from study abroad, young families, honeymooners, United Nations officials, and members of the U.S. military.
Students who have travelled abroad are nearly twice as likely as their home-bound peers to complete a college degree and report earning higher incomes, out-earning their peers by more than 40%.
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