The British chemist Sir Humphry Davy (born 1778) liked dangerous experiments. He was fired from his job as an apothecary for causing constant explosions. Later, as a chemist, he enjoyed inhaling the gases he worked with. This helped him discover that nitrous oxide (laughing gas) was a potent anaesthetic. “Unfortunately,” notes a short guide to his career from Oxford University Press, “the same habit led him to nearly kill himself on many occasions and the frequent poisonings left him an invalid for the last two decades of his life.” It was probably worth it: Davy isolated substances including calcium and strontium, identified the element iodine and made the first electric light.

Much like Davy, the UK is now experimenting on itself for the benefit of humanity. Advanced societies rarely do anything so reckless, which is why the Brexit experiment is so valuable. In between self-poisonings, Brexit keeps producing discoveries that surprise both Leavers and Remainers. Here are some early lessons for other countries:

When you focus on a wedge issue, you divide society. The Brexit vote has introduced unprecedented rancour into a traditionally apolitical country. Insults such as “enemies of the people”, “saboteurs”, “racists” and “go home to where you came from” are now daily British fare. Brexit rows split generations at family weddings and Christmas. All this was avoidable: until the referendum, few Britons had strong views on the EU, just as few Americans thought about transgender bathroom habits until their politicians discovered the issue. If you have to address wedge issues, best to aim for compromise rather than a winner-take-all solution such as a referendum.