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.
The Sand-Reckoner of Archimedes, tr. by Thomas L. Heath, [1897], at sacred-texts.com. Scanned, Proofed, and Formatted by John Bruno Hare at sacred-texts.com. This text is in the public domain in the United States because it was published prior to 1923.