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When the hydraulic pressure is removed from the well, small grains of hydraulic fracturing proppants (either sand or aluminium oxide) hold the fractures open. Hydraulic fracturing began as an experiment in 1947, and the first commercially successful application followed in 1950.
DEET was first developed by the U.S. Department of Agriculture for military use in 1946 and was first registered in the United States in 1957. It has been estimated that approximately 38 percent of the U.S. population uses DEET-containing repellents annually (Veltri et al., 1994; Selim et al., 1995).