Sagan, Dorion books

Cosmic Apprentice: Dispatches from the Edges of Science

I received this strange news item, but it had no address on it, so I am passing it on to lucky you. By post-man I will have meant (mostly) posthuman. And he (so to speak) rings twice. At least. The first ringing is literal and refers to what comes after humans in evolution. The first ringing anno...