Very nice point-counterpoint. Scientific discourse at its very best. Exceedingly well-sourced with simply splendid and expository quotes and commentary. The Author's own informed ruminations flesh things out nicely. The added links are a nice touch and most welcome. For those inclined toward a closer read on the subject matter they are well worth one's time. An informative piece on a fascinating topic. Do have a read. You will not be disappointed. Four stars!