On this day in 1999, Landsat 7 was launched into orbit.. Landsat 7 operations continue today, despite the Scan Line Corrector (SLC-off) anomaly.

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