General relativity has a number of physical consequences. Some follow directly from the theory's axioms, whereas others have become clear only in the course of the ninety years of research that followed Einstein's initial publication.
How much land area does it take to support your lifestyle? Take this quiz to find out your Ecological Footprint, discover your biggest areas of resource consumption, and learn what you can do to tread more lightly on the earth.
Open Culture is a treasure trove of educational and cultural media. Avid readers and lifelong learners should definitely check out the site for its huge meta lists of free textbooks, audio books, and eBooks.
Feature films, shorts, silent films and trailers are available for viewing and downloading. Enjoy! View a list of all the Feature Films sorted by popularity. Do you want to post a feature film? First, figure out if it's in the Public Domain.