 Professor Letterman’s assertion ‘The word for my favorite mental act is spelled j-u-d-g-m-e-n-t’ is robust with respect to the news that it is also spelled j-u-d-g-e-m-e-n-t. He would continue to assert it. He can conjoin the original assertion with information about the alternative: ‘The word for my favorite mental act is spelled j-u-d-g-m-e-n-t and is also spelled j-u-d-g-e-m-e-n-t’. In contrast, Professor Letterman’s assertion that ‘Martha is a woman’ is not robust with respect to the news that Martha is a borderline case of ‘woman’ (say, Letterman learns Martha is younger than she looks). The new information would lead Letterman to retract his assertion in favor of a hedged remark such as ‘Martha might be a woman and Martha might not be a woman’. Professor Letterman’s loss of confidence is hard to explain if the information about her borderline status were simply news of a different but permissible way of describing her. Discoveries of notational variants do not warrant changes in former beliefs.