The five most popular stories on CNN.com in the past 24 hours, according to NewsPulse:
Officials: Bombing at Moscow airport kills 35: A suicide bomber attacked Moscow's busiest airport on Monday, killing 35 people and wounding about 100, authorities and state television said.
Oprah Winfrey has a secret sister: Oprah Winfrey revealed on her television show Monday morning that she has a half-sister she knew nothing about.
2 officers killed, man found dead after shootout inside Florida home: A wanted Florida man shot and killed two St. Petersburg police officers Monday morning, and later the apparent assailant was found dead after police used a backhoe to tear through his house, authorities said.
Fitness guru Jack LaLanne dies at 96: American fitness guru Jack LaLanne died Sunday afternoon at his home in Morro Bay, California, according to his long-time agent, Rick Hersh. He was 96.
Malcolm Gladwell, master of explanation: In his books, Malcolm Gladwell puts his ability to question many of the things we think we know on display.