It emerged this week that the symbiotic relationship we've long understood lichens to be is a little more complex than was previously thought. In addition to the fungi and the algae or cyanobacteria (simply put, the former contributes a structured moist environment and the latter photosynthesises sugars from sunlight), yeasts have now been discovered living close to the surface. It's believed their function is to help fend off predators and repel microbes. This news adds another layer to an already fine example of cooperation that I've been sharing on my permaculture courses for a long time now. It is of course just one of a multitude of examples found throughout nature. All multicellular organisms, including our own human body, are clear evidence that working together is a better long-term strategy than going it alone. Our social tendencies express this too on a scale beyond the individual, but our modern society has put us in contact with more strangers than perhaps any time before in our history, bringing with it much mistrust and fear.
Our ancestors of course understood the security value of living in groups, but there's a point where size does matter. This is what Robin Dunbar taught us - that when groups get beyond 150 or so there are more people than we have enough time to have regular contact with and it's that interaction time that builds trust. So if you have more than 150 friends on facebook, well, if you're like me, many of them are still strangers aren't they? They may share interests with us, but those occasional virtual interactions don't bond us in the same way as those we enjoy face to face.