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Around 1717, Johann Heinrich Schulze captured cut-out letters on a bottle of a light-sensitive slurry, but he apparently never thought of making the results durable. Vast Expanses of Rock on Earth’s Surface May Act Like a Natural Solar Panel By Yasemin Saplakoglu First Published 2 years ago https://www.livescience.com/65309-photoelectric-current-minerals.html Scientists have found electricity flowing in an unexpected place — across the surfaces of rocks.  Mineral coatings on rocks turn sunlight into electricity, turning on like a light switch when the sun hits them, according to a study published April 22 in the journal Proceedings of the National Academy of Sciences. Photoelectric conversion on Earth’s surface via widespread Fe- and Mn-mineral coatings Anhuai Lu, Yan Li, Hongrui Ding, Xiaoming Xu, Yanzhang Li, Guiping Ren, Jing Liang,  View ORCID ProfileYuwei Liu, Hao Hong, Ning Chen, Shengqi Chu, Feifei Liu, Yan Li, Haoran Wang, Cong Ding,&nb[...]