These discrepant figures are due in part to the fact that Sierra Nevada had «the most significant amount of risk reduction and technology development work to do,» according to a statement by NASA when it awarded the latest round of funding in 2012. (scientificamerican.com)
This cycle of hot potato will end, and we will have opportunities to accept moderate or even significant amounts of risk, with proportionately high expected returns. (hussmanfunds.com)