Majority of women is less in science and tech! Why?

When a women move to opt for engineering, the first question is Why? Is it the right path for your career? There are several questions which are asked by people. There are very fewer women in these fields. Only 20% of the women hold this job but why there is such a huge gap? Why does it matter that this career will only be held by men? We have few clarifications to these questions.

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