A few weeks ago I came upon a blog post named If energy were free and unlimited, by David Gold. It’s an interesting “limits analysis” — if energy cost approached zero and energy availability approached infinity, what would happen? David’s main thesis is that economic prosperity would reign, but I think that this is incomplete. It’s true that energy is interwoven into everything that we do. Mass, however, is also interwoven into everything. Even disregarding what Einstein said, we still have to deal with inherent connections between mass and energy.