Leibniz was a German philosopher and mathematician who greatly expanded the field of calculus. He also perfected the binary number system—the basis for modern computing—and constructed one of the first practical calculators. A jack-of-all-trades, Leibniz worked on mechanical devices, delved into the study of logic, was a historian and lawyer at times, and is considered one of the fathers of geology. In the early 1700s, he became embroiled in a controversy with Isaac Newton over what issue? Discuss
Source: The Free Dictionary