Designed for anyone interested in mastering foundational subjects at the college level, OCW Scholar courses offer all the resources you need to learn independently. The courses are based on materials MIT students use in classrooms and also include special custom-created content. The materials are arranged in logical sequences and supplemented with multimedia such as video lectures, help-session videos, and simulations.
How much life could you find in one cubic foot? That's a hunk of ecosystem small enough to fit in your lap. To answer the question, photographer David Liittschwager took a green metal frame, a 12-inch cube, to disparate environments—land and water, tropical and temperate. At each locale he set down the cube and started watching, counting, and photographing with the help of his assistant and many biologists. The goal: to represent the creatures that lived in or moved through that space. The team then sorted through their habitat cubes, coaxing out every inhabitant, down to a size of about a millimeter. Accomplishing that took an average of three weeks at each site. In all, more than a thousand individual organisms were photographed, their diversity represented in this gallery. "It was like finding little gems," Liittschwager says.