What don't we know, and why don't we know it? What keeps ignorance alive, or allows it to be used as a political instrument? Agnotology—the study of ignorance—provides a new theoretical perspective to broaden traditional questions about "how we know" to ask: Why don't we know what we don't know? The essays assembled in Agnotology show that ignorance is often more than just an absence of knowledge; it can also be the outcome of cultural and political struggles. Ignorance has a history and a political geography, but there are also things people don't want you to know ("Doubt is our product" is the tobacco industry slogan). Individual chapters treat examples from the realms of global climate change, military secrecy, female orgasm, environmental denialism, Native American paleontology, theoretical archaeology, racial ignorance, and more. The goal of this volume is to better understand how and why various forms of knowing do not come to be, or have disappeared, or have become invisible.

From the archive:

Do you know, or are you guessing? Do you know, or are you guessing? You're guessing, aren't you..? No points! 0! You don't get any points for guessing!

Also:

Things will not be necessarily continuous.
The fact that they are something other than perfectly continuous
Ought not to be characterized as a pause.
There will be some things that people will see.
There will be some things that people won't see.
And life goes on.

A final thought:

If things go wrong with a puzzle, identifying the culprit is easy: it’s the person who withheld information. Mysteries, though, are a lot murkier: sometimes the information we’ve been given is inadequate, and sometimes we aren’t very smart about making sense of what we’ve been given, and sometimes the question itself cannot be answered. Puzzles come to satisfying conclusions. Mysteries often don’t.

Agnotology: The Making and Unmaking of Ignorance