The description of the `curious' badge reads: "Ask a well-received question on 5 separate days, and maintain a positive question record". What does the last part mean?
If half the total number of questions asked (including deleted ones) is greater than or equal to the sum total of (1) the number of deleted questions, (2) the number of questions with negative net score, (3) the number of closed questions, then the account has a positive question record. Note: the numbers of (1), (2), (3) are counted separately. Thus a question which has negative net score and was closed and deleted is counted three times (!). This is explained in the post that jeq linked to: https://meta.stackoverflow.com/questions/291457/viewing-question-record.