People in Britain will soon vote on whether or not to stay in or leave the European Union (EU). Newspapers have called it 'Brexit', which means Britain's, or British, exit. It is one of the biggest issues for Europe in decades. British people have very strong feelings about leaving and staying in the EU. A group of scientists has come together in support of staying in Europe. All of the 13 scientists are Nobel Prize winners. The group says leaving the EU would be a "key risk" to British science. A spokesman explained how important it was for science that Britain remained in Europe. He said: "Inside the EU, Britain helps steer the biggest scientific powerhouse in the world."