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This week: The World’s Technology Correspondent Clark Boyd is in the host chair. He brings you science news from four continents: In Africa, medical workers battle a common cause of blindness. In Asia, a small nation provides scholarships to attract science talent. In Europe, scientists study what happens when we get lost in the woods. And in Australia, a biologist tries a new strategy for battling malaria. Also: astronomers find an unlikely planet, and researchers gain insights into the brains of bilinguals.

Elsa is back with her favorite science stories. Her picks this week:

• Bilingualism: Learning a second language can influence how the brain processes a native language. That’s the finding of a Belgian study of people who speak both Dutch and English. (The study was published in the journal Psychological Science (volume 20, number 8,) but since you need a subscription to even see the abstract, here’s a press release too.)

• Odd Planet: An international team of scientists has detected a planet that shouldn’t exist. This “hot Jupiter” is so close to its sun that it completes each orbit in less than a single Earth day. (The study.)

• Malaria Vaccine: An international team of scientists has genetically modified the parasite that causes malaria. Could this lab-created organism be the basis for an effective vaccine? (The study.)

Fighting Blindness: Trachoma is a bacterial infection of the eye and a leading cause of blindness. Though largely eradicated from the industrialized world, trachoma remains a common affliction in developing countries. We visit the nation with the highest burden of disease and see how one American organization is trying to preserve sight for millions.
Report: By Odette Yousef in Ethiopia. (See photographs here.)

Singapore Science: Singapore considers science the key to its future economic growth. The Asian city-state  is building world-class laboratories, but it lacks trained personnel to staff those labs. So Singapore is reaching out to other countries for the science talent and science education it needs.
Report: By Ari Daniel Shapiro in Singapore.

Lost in the Woods: A new study by scientists in Germany has confirmed that when people get disoriented in the woods or other natural environments, they really do tend to walk in circles. The researchers sent volunteers into a German forest and the Sahara Desert and tracked their movements by GPS. (Click here to see a Google Earth image of the paths taken by some volunteers in the German forest.)
Report: By The World’s David Baron.

Music:

Walkin’ in Circles, by Charles Brown with Johnny Moore’s Three Blazers