Recently, NASA released a new Blue Marble graphic, from sensors aboard TERRA. The Talk of the Nation Science Friday video of the week tells the story of these NASA's Blue Marble maps. From the Apollo 8 crew's image from 1968, to the Apollo 17 mission of 1972, through the Voyager image, through modern remote sensing techniques, to 2002's original Blue Marble image (now used as the default background on the iphone), to this new release. They highlight the work of Rob Simmon and Gene Feldman, who discuss the composition of the product, highlighting the art that goes into the scientific product. Very cool! More discussion here.