A viral email (also known as a pass along email ) is a certain kind of email which rapidly propagates from person to person, generally in a word of mouth manner.

If due to a viral agent, the condition usually resolves within one week.

Human cells comprise genes of eukaryotic, bacterial, archaean, and viral origin.

A viral video is a video that becomes popular through a viral process of Internet sharing, typically through video sharing websites, social media and email.

By turn hilarious and haunting, poet Shane Koyczan puts his finger on the pulse of what it's like to be young and different. To This Day, his spoken word poem about bullying, captivated millions as a viral video . Here, he gives a glorious, live reprise with backstory and violin accompaniment by Hannah Epperson.

NEW YORK Is this the Age of the Conspiracy Theory? Plenty of evidence suggests that we are in something of a golden age for citizen speculation, documentation, and inference that takes shape usually on the Internet and spreads virally around the globe.