How much does a social worker make? According to the May 2012 records from the Bureau of Labor Statistics, the mean annual healthcare social worker salary is $51,460, or $24.74 per hour. The lowest ten percent earn $31,410, while the top ten percent make an average of $74,030 annually.
The Leibniz Step Reckoner. Gottfried Leibnizâs 1673 âStep Reckonerâ introduced a design innovation that enabled a single gear to represent any digit from 0 to 9 in just one revolution. This stepped-drum approach dominated calculator design for the next two centuries. Gottfried Leibniz.
Henry Ford. American car manufacturer, Henry Ford (1863-1947) invented an improved assembly line and installed the first conveyor belt-based assembly line in his car factory in Ford's Highland Park, Michigan plant, around 1913-14.The assembly line reduced production costs for cars by reducing assembly time.ansome Eli Olds. The first automobile to be mass produced in the United States was the 1901, Curved Dash Oldsmobile, built by the American car manufacturer Ransome Eli Olds (1864-1950). Olds invented the basic concept of the assembly line and started the Detroit area automobile industry.