... what hep humorists here are already calling "Critical Mass" (get it? not too many did in 1945, the Cosmic Bomb was still trembling in its earliness, not yet revealed to the People, so you heard the term only in the very superhepcat-to-hepcat exchanges). --- Thomas Pynchon, Gravity's Rainbow This is a page of links to information about the Tierra digital evolution software. The Tierra software