Even in the desert there is water, if you drill deep enough. thumbnail: http://svs.gsfc.nasa.gov/images/gallery/Landsat/Wadi As Sirhan compare_gal.png

STELLA: A DIY Handheld Scientific Instrument
If you are looking for a do-it-yourself (DIY) handheld spectrometer, you need to meet STELLA. STELLA (Science and Technology Education for Land/Life Assessment) is a portable scientific instrument developed by