President Donald Trump’s executive order banning visitors from seven countries from entering the US has scientists concerned about what might come next, as Peter Gwynne reports
Marching on
Protest against the Trump administration’s travel ban in Washington DC on 4 February. (Courtesy: Masha George/public domain)
The scientific community has reacted with dismay at US President Donald Trump’s executive order to
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Peter Gwynne is Physics World's North America correspondent