US election 2020: Trump's impact on science, plus the maths behind voting

US citizens will decide today whether to give President Donald Trump four more years in office or hand over the keys of the White House to former Vice-President Joe Biden. But what is the impact of Trump's first term and what can science tell us about elections?

US election 2020: Trump's impact on science, plus the maths behind voting

Photo: images.newscientist.com