There is no doubt that spaceflight entails risks, and to pioneer a new mode of travel is to face those risks, and to reduce them with the benefit of hard-won experience.
If they should decide to reduce the current account surplus, should they allow faster appreciation of the nominal exchange rate or overheating and faster inflation?
But smaller companies and university officials say the growth of digital distribution could also allow them to challenge the majors by lowering barriers to entry.
I confess I enter this in a skeptical frame of mind, believing that we tend to get carried away in our desire to reduce everything to the quantifiable.
It had been thought that the breaks in the skin were the reason for higher HIV rates, but a study last year found that treatment of herpes with drugs did not reduce the HIV risk.