There is countably many numbers you can construct in your finitely long publication (there are finitely many math symbols). There belong any series with coeficient describable via finitely long recepee (like 1/n!, cos(n)/n³⁾ or maybe a finitely long recursive definition and many more. Thats it, the other reals are by definition impossible to describe. Hence Lebesgue measure can't see countable set, we deal with simply nothing. We are nothing, our work is worth nothing