Women need more work experience before they are comfortable applying for a promotion, according to new research.gettyWomen’s representation at the top of business and politics remains stubbornly low. Now, new research may help explain why.Fewer than one in ten S&P 500 companies are led by a female CEO, and only 26% of the U.S. Senate seats are held by women. Sixteen states have never elected a woman to the Senate, 18 have never had a female governor, and a woman has never been president. A new set of studie ...