Major life events: birth, life, death, marriage, divorce, significant increase in wealth, or any other major life event.

FORBES: Mark Madoff's Will Provides Important Lesson: Keep Your Estate Plan Up-To-Date

Zuckerberg defended the practice of not showing a full and complete chronological feed of all content, saying people benefit from more important content, such as major life events, being given a more prominent place in their feeds.

CNN: Facebook revamps site, tweaks mobile apps

He runs through all the formative experiences and major events in Mr Miller's life.

ECONOMIST: Literary biography

Considering the major events that have rocked the world in 2011, can we possibly imagine life without the NFL or NBA in the fall?

FORBES: World Won't End Saturday, But NFL And NBA Should Beware

Abrupt methane releases from frozen regions may have played a major role in two events, 55 and 251 million years ago, that extinguished much of the life then on Earth.

BBC: Climate 'tech fixes' urged for Arctic methane