I have no candidates for a single scientific principle, concept, or discovery - because I do not think that any single piece of knowledge or understanding would have any value in splendid isolation. As the structuralists say, you need at least two pieces of information before you can make any sense of either of them. I think people need to understand more about what science can and cannot claim to be sound knowledge, and why, rather than knowing any specific scientific facts or concepts as such.

Nicholas Russell is coauthor of Food Preservatives (buy this book from Amazon (UK) or Amazon (USA)).