By CECILIA M. VEGA and HEATHER KNIGHT, San Francisco Chronicle

A special investigative report by Scripps Howard News Service has prepared an in-depth look at the issues surrounding vaccine exemptions and the risk of disease resurgence.

Thousands of unvaccinated children enter schools
• Fears of long-range side effects fuel vaccine debate
• Cost of vaccines puts them out of reach for many
• Poll: Americans see both need, potential dangers of vaccines
• Facts about common vaccines

A special investigative report by Scripps Howard News Service digs into the troubled condition of the embankments that stem floodwaters around the nation.

America's neglected levees put millions in danger
• Levee gaps could swamp Smithsonian, National Mall
• Millions could face huge flood insurance bills from levee map
• Certifying a levee as safe is costly and difficult
• Law changes could mean billions in flood insurance costs