Egyptians, Ancient function

A dried gourd containing seeds probably functioned as the first baby rattle, ancient Egyptian wall paintings show babies with such gourds clutched in their fingers. 

Electricity (in the form of electric fish) was used by ancient Egyptians and Romans for therapeutic purposes. In the eighteenth century, the work of Swiss anatomist Albrecht von Haller, Italian physician Luigi Galvani, and Benjamin Franklin set the stage for the use of electrical stimulation to restore movement to paralyzed limbs. The basis of modern NE is early neuroscience research demonstrating that neural function can be recorded, manipulated, and mathematically modeled. In the mid-twentieth century, electrical recordings became popular as a window... 

The history of surfactant applications in personal care products can be traced back to the ancient Egyptians. Soap was the only available surfactant in those early centuries. It was not until the Second World War that synthetic surfactants were developed and formulated into daily personal care products. Diversification and expansion of synthetic surfactants based on the technological and economical advances of the oleochemical and petrochemical industries made surfactants indispensable for daily life in industrialized countries such as the United States, western Europe, and Japan, and the same trends are expanding throughout the world. We now face a controversial problem cleansing ability as the primary function of surfactants versus gentleness to humans and environmental impact. 

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