Science and vision are not opposites or even at odds. They need each other. I sometimes hear other startup folks say something along the lines of: 'If entrepreneurship was a science then anyone could do it.' I'd like to point out that even science is a science and still very few people can do it let alone do it well.
Few women I fear have had such reason as I have to think the long sad years of youth were worth living for the sake of middle age.