As I write this, Theresa May, the Prime Minister of the United Kingdom, has just triggered Article 50 for the UK to leave the European Union. That decision brings a period of considerable uncertainty for the chemical sciences in the UK and it has significant implications for our European scientific community. So it seems like a good moment to reflect on the importance of working together across borders for the future of our science and of our world. Our two chemical communities have a fantastically rich tradition of working together. Indeed, our societies have very special links regarding their respective inceptions. The Royal Society of Chem...