There are plenty of people who lose money flipping houses. It might sound easy, but in practice it isn't. More likely, if you go into a career trying to cure

There are plenty of people who lose money flipping houses. It might sound easy, but in practice it isn't. More likely, if you go into a career trying to cure cancer; there is a big pharmaceutical company or research institution behind it. They may be taking a big risk; but the career risk for you personally is not that big. You'll draw a salary even if you don't cure cancer.