It's far from clear that NASAs general conservative nature has been a good thing relative to a more risk-tolerant one. If we accepted more failure, could we acc

It's far from clear that NASAs general conservative nature has been a good thing relative to a more risk-tolerant one. If we accepted more failure, could we accomplish a lot more? Particular with SpaceX on the scene, it's time to start rethinking risk, because launch costs will be so much lower.