Even when he is positive, Mr Roberts's views are open to question.
And it is the case, as Secretary Clinton said today, that even now there are things that are still open to question and assessment as more facts come in, and that's why the investigation is continuing.
In several countries, efforts are now being made to re-open this question (see article).
How many of these people are really necessary given the fact that they are no longer mounting combat operations is open to question.
If Secretary Lord's protestations about the Clinton commitment to being "the most open Administration on this question since the war ended" are to be taken seriously, the Administration can do nothing other than throw its support behind such a vigorous investigation.
It remains an open question whether they are as crucial to success in groups larger than the half-dozen or so people typical of foraging parties in hunter-gatherer societies.
The notion that universal banks are worse for shareholders than other banks is also open to question.
Whether consumers are willing to give BlackBerry a second look is an open question.
It remains an open question as to whether government insurance schemes are included in this deal.
The rules on papal succession were open to interpretation and "this is a question that people are discussing", he said.
Why there are only two base pairs is an open question, and one which evolutionary biologists and geneticists want to answer.
The open question now is whether the hedge fund managers who opt to go the way of retail UCITS are able to deliver to their investors the performance and returns that they have promised.
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