We accidentally came across this website while surfing topics related to tropical rainforests (we're visiting our own Washington temperate rain forest soon). The Elizabeth Viau site is a wonderful imaginative scientific romp into designer 'worlds'. The computer technology is fairly low tech, but the science is intriguing. Great ideas here for problem-based learning in astronomy, geology, biology, and environmental science in general. Students gain practice at identifying questions and making predictions.
World Builders Lessons