<pTop scientists from around Europe warned Tuesday that Brexit<pA letter signed by 29 Nobel laureates and six winners of the Fields Medal mathematics prize urged May and European Commission President Jean-Claude Juncker to ensure the "closest possible cooperation between the U.K. and the EU" after Britain leaves the bloc.
<pThe letter said scientific innovation "requires the flow of people and ideas across borders to allow the rapid exchange of ideas, expertise and technology."
<p"Creating new barriers to such ease of collaboration will inhibit progress, to the detriment of us all," said the signatories, who include biologist Venki Ramakrishnan and economist Christopher Pissarides.
<pThe London-based Francis Crick Institute, the biggest biomedical research lab under one roof in Europe, also warned that a "hard Brexit" that put up barriers to the flow of people, goods and services would be detrimental to British science.
<pCrick director Paul Nurse, who shared the 2001 Nobel Prize in medicine for his cancer research, said "we need a deal that replaces the science funding lost because of Brexit, that preserves freedom of movement for talented scientists, and that makes them feel welcome in this country."
<pThe British government says it is seeking "an ambitious relationship on science and innovation with our EU partners" after Brexit. But the details of new arrangements will not be worked out until after the U.K. leaves the bloc in March.
<p"There isn't absolute certainty now, which I would love to be able to give," U.K. Science Minister Sam Gyimah said Tuesday. "But what I can say is we are aware that, if we want to be the go-to place for science – which is our ambition as a nation – then mobility and reducing friction has to be a key part of that."
<pThe two sides hope to have a withdrawal agreement and the outlines of a deal on future relations in place well before the U.K. leaves the EU on March 29. But fears are growing the U.K. might leave without a deal in place, leading to chaos at ports and major economic disruption.
<pOn Tuesday, May ordered her Brexit minister to provide the Cabinet with weekly updates on preparations for a "no-deal" Brexit.
<pThe main roadblock to a deal is the 310-mile (500-km) border between the U.K.'s Northern Ireland and EU member Ireland.
<pBritain and the EU agree there must be no barriers that could disrupt businesses and residents on both sides of the border and undermine Northern Ireland's hard-won peace process. But so far, each side has rejected the other's solution.
<pThe EU has proposed keeping Northern Ireland in its customs union after Brexit, eliminating the need for border checks. But Britain says that is unacceptable because it would mean checks between Northern Ireland and the rest of the U.K.
<pBritain's counter-proposal is to keep the whole U.K. temporarily in a customs union with the bloc. Irish broadcaster RTE reported Tuesday that the EU was willing to offer Britain a U.K.-wide customs union, though details remained unclear.