I don’t think I have previously mentioned my lifelong obsession with Doctor Who. The revived BBC has been wonderful and I am so excited by the excellent performances of Matt Smith as the Eleventh Doctor and Karen Gillan as his companion Amy Pond. Another intriguing character is River Song, whose relationship with the Doctor is being slowly revealed through a storyline extended across regenerations and series.
Their atemporal relationship is complex and I found it helpful to use one of my favourite applications, Omnigraffle, to draw this diagram of their meetings. Comments and corrections are welcome.