We still have a long way to go until there are 250 (or 500!) women leading our nation's biggest businesses, but for today, let's not wring our hands about the progress we still have to make and instead focus on our tremendous accomplishments. We've got 50 incredible examples of women shattering glass ceilings and helping a younger generation of women see how much you can accomplish when you dream big (and, as Burns once said , work hard, have help from others, and the courage to lean in).