Ask a question: a new type of contribution to MPO

Letter from the Editor:

Dear readers:

I am pleased to inform you that we are inviting a new type of contribution to MPO. This new section is called "Ask a question". Quite often, we raise questions that we may not have an answer for. It is probably just a matter of asking that question to the right people and the answer will come from somewhere or at least we may know if nobody can answer our question.

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