Useful links
Khan Academy - What shall I learn today? Brief, free explanations of mathmatical, scientific and historical information.
Merriam-Webster - When it's easier to look something up online, rather than walk to the bookshelf. (Fun vocabulary quizzes, too!)
Chincoteague National Wildlife Refuge - Just looking at the images is a respite.
Wallops Flight Facility (NASA) - View rocket launches live.