Often, the best way to explain a scientific idea to someone is to put it in terms they can easily envisage, using a cleverly chosen metaphor, simile or other quip. A bon mot can clarify a tricky concept more easily than all the powerpoint presentations in the world – a case in point being Mark Twain’s pithy meteorological explanation: “Climate is what you expect; weather is what you get.”

So the ESA decided to hold a competition to find the best analogy to explain an ecological concept – in a field where ecologists often have problems explaining ideas to each other, let alone to the public. The runner-up’s prize went to the following explanation of the staggering odds against an individual salmon successfully reproducing: Imagine you have to drive from the centre of a city all the way to the highway on the outskirts without stopping even once. Thus, if you come up against just a single red light anywhere on the journey you don’t make it.

The winning entry sought to explain the complex issue of ecosystem stability in terms of Jenga. Say each brick represents a species – at first, removing a piece makes the system a little more unstable, but overall it still stands up. But remove too many bricks and there comes a point when it all comes crashing down.