In the end, it took a study to confirm that we're getting buried by studies - and it's impacting the brains of researchers. Some scientists formulated complex equations and concluded that with the new media age comes more material, and with more material comes a decline in our attention towards the important scientific studies.

Knock. Knock. Who's there? Joe King. Joe King who? Joking like this used to be considered a sickness by some people. The knock-knock joke has been a staple of American humor since the early 20th century. With its repetitive set-up and wordplay punchline, the form has been invoked - and understood - by people of all ages and sensibilities.