Abyssinia Abyssinia, which is intended as a living museum & educational resource on the Science Circle’s OpenSim grid, is my reconstruction of ancient archaeological sites in Tigray (northern Ethiopia) & Eritrea that date from at least 1000 BCE through roughly 800 CE. I excavated at several of these sites decades ago (1969-1972), & now am […]

Understanding Science: The Day the Dinosaurs Died – A Lesson in Planetary Ecology This series of presentations started with the worlds of the very small (particle physics) and very large […]