Two Americans involved in a teaching exchange program in China have been detained near Shanghai for allegedly “illegally moving people across borders.”

ON THIS DAY IN AMERICAN HISTORY On October 17, 1989, San Francisco is rocked by the biggest earthquake since 1906. The quake came moments before game three of baseball’s World Series between the San Francisco Giants and Oakland Athletics, held at Candlestick Park in San Francisco. Millions of Americans saw it on live television. The quake, a magnitude 6.9, killed 63, injured thousands and caused damage to more than 100,000 buildings.

The United States is requiring all Chinese diplomats in the country and Chinese officials traveling to the U.S. on official business to give the State Department advance notice of meetings with local, state and federal officials, as well as educational and research institutions.

VIDEO: Many Mongolians are moving to the capital city, Ulaanbaatar. The capital now competes with New Delhi for the title of most polluted capital because of the coal burned during the winter. VOA looks at one possible solution.

Mosibudi Jo Mathole and Khomotso Ramodipa are rare gems in the male-dominated diamond industry. The South African sisters run one of the few women-owned diamond polishing businesses in the world. And, despite the slumping global market for diamonds, they’ve managed to keep shining and developing new female talent.

VIDEO: Every year, an estimated 12-million girls younger than age 18 get married. Some are forced. Some do it out of a sense of obligation. For others, it is out of desperation. Plugged In with Greta Van Susteren examines the issue with profiles of women who married very young.