A big part of the allure of investing in small and mid-cap stocks is their potential to be worth much more in the future. After all, it's a lot more probable that a company that's only worth a few billion dollars will grow its business enough to double in value than it is for a company that's already worth hundreds of billions. But smaller stocks also come with more risk, as they're often unproven and not well-established businesses.Ginkgo Bioworks (DNA -0.57%) is a mid-cap company that has some promising l ...