In 1968, while studying at the Mons Officer Cadet School in the United Kingdom, I needed to visit a hospital. There I met a doctor who, to my surprise, spoke fluent Arabic. I learned that he was new to the UK, so I asked if he intended to stay long or return home. He replied with an Arabic saying that translates as: "My home is where I can eat."

That doctor's words stayed with me for many years, because they underscored the contradiction between our idealized view of "home" and the harsh realities of life that push talented people to leave their homes.

The doctor was a classic case of the brain drain phenomenon that has afflicted developing countries for decades. These countries spend scarce resources educating doctors, engineers, and scientists, in the hope that they will become engines of prosperity. Then we watch with dismay as they migrate to the West, taking with them the promise of their talent.

It is, of course, everyone's right to choose a better life, wherever in the world they wish. We understand why they go. Talent is drawn - like a magnet - to opportunity.

For the countries left behind, however, it feels like an endless vicious cycle, they need talent to create opportunity, but without opportunity, talent gravitates to the bright lights of the West. Indeed, the United Nations and the Organization for Economic Co-operation and Development report that migration for work has risen by one-third since 2000. One in nine university graduates from Africa now lives and works in the West. Many will not return: skilled workers are six times more likely to stay away.

But now something remarkable is happening. In some countries, the brain drain has reversed its flow. The causes are fascinating, and there is reason to be optimistic that the vicious cycle can be broken, transforming the balance of hope and opportunity between developing and developed economies.

A new study by LinkedIn, the world's largest online professional network and recruitment platform, has measured the net international movement of talent among its members. Topping the list as a destination for talent is my own country, the United Arab Emirates, with a net talent gain of 1.3 percent of the workforce in 2013. Other net "talent magnets" include Saudi Arabia, Nigeria, South Africa, India, and Brazil.

Most interesting, fewer than one-third of net talent importers are developed countries. In fact, the top talent exporters in this study are Spain, the UK, France, the United States, Italy, and Ireland. Rich countries that until recently had been tempting away our brightest minds are now sending us their own.

Of course, this is only one study, and many poor countries still suffer from a chronic talent exodus. OECD data show that many countries in Africa and Latin America have migration rates for graduates above 50 percent.

We do know that brain drain is often a function of safety and security as much as economic opportunity. Part of the tragedy playing out in Middle Eastern countries beset by conflict and instability is that if only their most talented sons and daughters could apply their skills at home, they would become part of the solution: agents of peace through development. This makes it all the more important to examine how some developing countries succeeded in reversing the outward flow.