And I always thought that Pythagoras (569-475 BC Greece) was one of he first practisioner of Mathematics. May have had a different name then but it is still mathematics. Hell the Chinese invented the solution to a matrix equation as early as the 2nd century AD. The old sumerian and Assyirian societies had mathematicians as well. Comenius lived in early 1600's. I think you will find he did far more in the field of education.

6 knot on a 25 ft mono, still some (1.34 * sq.rt (25) - 6 = 0.7 knot to go before you hit theoretical hull speed. In big wind you should be able to up to 1.7 knots out of it.

Wouter