Rest your weary eyes and give your ears a chance to absorb some knowledge for a change. The National Academies provides a weekly podcast series, The Sounds of Science:

This informative and entertaining weekly series of audio podcasts puts the spotlight on the high-impact work of the National Academies. Focusing on a wide range of critical issues in science, engineering, and medicine, these short 10 minute episodes are a quick and easy way to tune in to all the key findings and important recommendations made by the Academies.

Not familiar with podcasts? Podcasts are audio files that are delivered directly to your desktop computer, and can be listened to on your computer or transferred to your iPod or other MP3 player. Learn more about podcasts on wikipedia.