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Carl Friedrich Gauss...
Yes. Maths
On March 30, 1796, Gauss discovered that it was possible to construct a regular polygon with seventeen sides using a straightedge and compass. This was the first new construction of a regular polygon since the time of Euclid. The discovery, made when Gauss was only eighteen years old, persuaded him to make mathematics his career.
At 24 years of age, he wrote a book called Disquisitines Arithmeticae, which is regarded today as one of the most influential books written in math. He also wrote the first modern book on number theory, and proved the law of quadratic reciprocity. In 1801, Gauss discovered and developed the method of least squares fitting, 10 years before Legendre, unfortunately, he didn't publish it. Gauss proved that every number is the sum of at most three triangular numbers and developed the algebra of congruences.
Gauss's method was to find the sum of 1-100. He tried adding with pairs 1 + 100 = 101, 2 + 99 = 101 and so on. Each pairs was going to equal 101. Half of 100 is 50, 50 x 101 = 5,050.