Thinktank is on three continents this week. We're out getting our hands dirty in the field in Vietnam and Cambodia, with China on the horizon. Plus we have someone posted out in Chicago - coincidentally at the heart of the presidential primaries - who will be covering a good part of the Great Lakes region. And if it's Thursday (which it will be shortly) then it must be Paris. Sabine will be spending two days running groups in the French capital, before trekking across the border to do then same in Frankfurt.