Last week’s post here commented on the ways that proponents of nuclear power have tried to put their spin onto a situation that seems to be taking a perverse pleasure in frustrating them. One of their tactics seems to have shifted into overdrive over the last week: the insistence that even though all past and nuclear technologies have turned out to be far less safe and spectacularly more expensive than their promoters claimed at the time, future nuclear technologies not yet off the drawing boards will surely be safe, clean, cheap, and reliable sources of energy. Those of my readers who know their way around the software industry have heard this kind of song and dance before, often enough so that there’s a useful term for it among computer geeks: vaporware.