1) The essay on ERV-3 (the retrovirus that may code for immunosuppressive properties of the plactental barrier) is 16 years old (not 30).
2) I meant to say "viroids" not "virions"—a virion is an infective viral particle. A viroid is a small circle of RNA that probably dates all the way back to RNA world.
Apologies.
Coming next: There's No Place Like Home (my review of the latest eco-sermon).
