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United at CAST 2017 Houston
Submitted on October 9, 2018
Visit us at CAST 2018 Texas Science Teacher conference in Ft. Worth, November 1st-3rd
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Submitted on September 8, 2017
Moist earth is used as an electrolyte to create electricity in a voltaic cell. In 1841, Alexander Bain (1810 – 1877) demonstrated the ability of moist dirt to aid in generating electricity.
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Submitted on September 4, 2017
Observed mostly in winter and spring in water-logged surface soils, these sheen areas (actually biofilms) are produced by iron bacteria (Leptothrix discophora) that live in iron rich soils. These bacteria thrive in anaerobic conditions caused by water-saturated soil conditions.
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Submitted on August 29, 2017
What do Edgar Allen Poe, George Washington, and Benedict Arnold have in common? They all employed various sympathetic stains (invisible inks) to safeguard their communications.
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