More people in Northern Ireland want the union and the United Kingdom than want a united Ireland.
But the gap is closing, more younger people favour Irish unity than not, and there is no outright majority for the union.
Meanwhile in Dublin, both Fianna Fáil and Fine Gael have begun to engage with the subject, or at least are being seen to.
What have they been doing – and how seriously should we be taking it?
Ciarán Dunbar is joined by the Belfast Telegraph's Northern Ireland editor Sam McBride, and by Aisling Moloney, political correspondent with the Irish Independent.
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