Graphic comparing three images of the U.S. National Mall. thumbnail: http://svs.gsfc.nasa.gov/vis/a010000/a010800/a010873/AB-National_Mall_image_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