AI Tutor
When you read a cutting-edge scientific paper or investigative report, the most revealing sentence often isn't what the authors proved—it's what they admit they cannot yet explain.
Rigorous authors don't pretend to have total certainty; they deliberately mark the exact boundaries where empirical data stops and unresolved questions begin.
How do professional writers signal that a topic is still an open question without undermining their credibility?

The Anatomy of Textual Uncertainty

Textual uncertainty appears in three distinct forms: hedging language, evidentiary gaps, and competing hypotheses.
Let's examine how subtle word choices act as immediate indicators of where certainty drops.

Epistemic Modality and Hedging

An epistemic modal is a qualifying word—such as may, appears to, plausibly, or tentatively—that reflects a writer's degree of confidence in a claim.
Notice the massive difference between stating "the fossil proves early bipedalism" and "the fossil may suggest early bipedalism." The second phrasing explicitly leaves room for doubt.
What does this look like in a complex, authentic scientific passage?

Worked Example: Analyzing Ambiguity