Pierre. Just to say your book arrived a couple of days ago. I'm only a few chapters in, so can't give a thorough response yet, but thus far thoroughly enjoying the read. As ever you distill so much information into an immediate yet clear and economical fashion that I find myself utterly gripped. What a page turner! I just love the way you introduce the reader to what would normally be mind-blowing deductions (e.g. water exchange between earth and Mars) without the slightest sense that we should be surprised or in anyway find this outlandish. The whole argument holds together like super-glue and I look forward to learning much from your work - as always - and enjoying the roller-coaster ride to the end! Much respect. Thank you and all the supporting team for all the undoubted effort that went into its distillation and publication.