Crossing Boundaries

U.S. world population, current population estimates for the United States and the world, population clocks.

satellite tracking of migratory birds

This web page is great for teaching sceince using case studies. You do need tp go through a registration process and there are a few hoops to jump through but it is worth it!

With an old computer and 30 dollars worth of off-the-shelf components, you can gear up with cutting edge avian monitoring technology and help save the birds. For years, birdwatchers counted by sight during the daytime. The night - when most migratory birds travel - was literally hidden to them. But that's changing. Anyone can attach a microphone to a computer running birdcall-identifying software and track birds passing overhead in the darkness.

social networking by NSTA

authoritative source for information on more than 70,000 plants, animals, and ecosystems of the United States and Canada. Explorer includes particularly in-depth coverage for rare and endangered species.

Review of the book that outlines how goods could be designed for a cycle of use, reducing waste and eliminating the need for landfills