US president Joe Biden speaks during a Memorial Day ceremony at Arlington National Cemetery in Arlington, Virginia,  on Monday. Photograph: Bloomberg

US president Joe Biden will take part in a remembrance of one of America’s darkest moments of racial violence on Tuesday, marking the 100th anniversar(...)

2020 coronavirus-fuelled shutdowns saw greenhouse gas emissions in the US fall 10 per cent. Photograph: Getty Images

Last year’s coronavirus-fuelled shutdowns saw greenhouse gas emissions in the US, the world’s second largest carbon emitter, fall 10 per cent – the mo(...)

Former Fed chairwoman Janet Yellen: nominee for US treasury secretary. Photograph:  Brendan Smialowski

Joe Biden, the US president-elect, on Monday unveiled an economic team that sought to balance experienced Democratic policymakers who will be well-rec(...)

Jennifer Psaki, former White House communications director and state department spokeswoman under Barack Obama, will be White House press secretary. Photograph: Brendan Smialowski/AFP via Getty Images

US president-elect Joe Biden has given top economics and communications positions to former aides to Barack Obama and Hillary Clinton, appointing wome(...)

Terry Tao. Photograph: Graeme Mitchell/The New York Times

Pick a number; if it is even, divide it by 2; if odd, triple it and add 1. Now repeat the process, each time halving or else tripling and adding 1. He(...)

Prof Terry Tao’s Hamilton lecture will draw on his childhood fascination with astronomy and distances between planets.

Terry Tao is probably the world’s best problem solver in mathematics – the skill that is the essence of this essential creative science. So it’s more(...)

The US says the St Petersburg-based Internet Research Agency has used social media to spread disinformation about US elections. Photographs: Nicolas Asfouri and Lionel Bonaventure/AFP via Getty Images

After the FBI tipped off Facebook that the obscure leftwing website Peace Data was a clandestine front for Russia this week, the site’s anonymous admi(...)

Protesters plan to mark Juneteenth with demonstrations against racism and police brutality. Photograph: Jeenah Moon / Getty Images

A growing list of US companies across finance, technology, retail and other industries are giving employees Friday off to commemorate Juneteenth. Whil(...)

 Protesters march down 5th avenue  on June 10th in New York City. Photograph: David Dee Delgado/Getty Images

There are no racists in the United States. I immigrated here 27 years ago, and I have never met anyone who would call themselves a racist. And yet&nbs(...)

Dr Mary Canning, President of th Royal Irish Academy. Photograph: Johnny Bambury.

The setting up of an independent network of scientific advisers is needed to advise government “on the formidable scientific challenges facing Ireland(...)

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