All these models involve more sharing than American consumers are typically accustomed to doing.

WSJ: Renting Prosperity

They involve ginning up microbes to do things that we really need doing such as making clean fuel, sucking up carbon dioxide, cleaning fat out of our arteries, giving us a lot more immunity to nasty bacteria and viruses and helping us make plastics and chemicals more efficiently and cheaply.

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Most investors may be hard-pressed to earn 5% or better on their investments, and doing so may involve a lot of risk as well.

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Many franchises involve getting out in the community or working outdoors, doing jobs from house painting to pet care to pest extermination and more.

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At this time of year, walking from one to the other will probably involve negotiating four jugglers, two unicyclists, a retro-clad maiden doing light operatics and a local who's trying make a quid from her world-record number of body-piercings.

BBC: Edinburgh: Not just a pretty festival