 Plausible as this reply has seemed to most philosophers, it has been effectively challenged by Lasonen-Aarnio (2014b). Her argument is this: presumably, it’s possible to have more than enough evidence to know some fact. But if it’s possible to have more than enough evidence to know some fact, it follows that one might still know that fact even if one acquires some slight evidence against it. And yet, it would be wrong to leave one’s confidence entirely unaffected by the slight evidence that one acquires against that fact: though the evidence might be too slight to destroy one’s knowledge, it cannot be too slight to diminish one’s confidence even slightly. So long as one could continue to know a fact while rationally diminishing one’s confidence in it in response to new evidence, the most popular reply to the defeasibility argument fails.