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.
John Lee Love's improved plasterer's hawk was patented on July 9, 1895 (U.S. Patent # 542,419). List. Inventions. Famous Inventors You Should Know: Garrett Augustus Morgan Garrett Augustus Morgan - Cleveland inventor and businessman who invented a device called the Morgan safety hood and smoke protector aka gas mask.