I haven't.
I don't know if Dr. Dixon has worked on the big picture of that.
On June 16th, 2009. See this statement in context.
June 16th, 2009 / 10:50 a.m.
Professor, Department of Earth and Environmental Sciences, University of Waterloo, As an Individual
I haven't.
I don't know if Dr. Dixon has worked on the big picture of that.
See context to find out what was said next.