The Solvay conferences that were held in Europe in the 1930s were famous for getting together leading scientists - including Bohr, Einstein, Dirac and Fermi - to puzzle over the big questions of the day. Since then, scientists have enjoyed the ability to travel freely to speak at conferences or visit colleagues in other countries. Such international collaborations have long been a boon for science, improving our collective knowledge, expanding research capabilities and boosting economies.
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