California is the first state to require food makers to add folic acid, a crucial vitamin, to corn masa flour used to make tortillas and other foods. It's a move ...

Now retired, Wang Meili wants to see the world -- including North Korea, the reclusive nation that lies across the river from her lifelong home in northeastern China.

In a corner of suburban Singapore, Betty Boon vaults a guardrail, crawls underneath a slide, executes forward shoulder rolls and scales a steep slope, finishing the course to applause.