French president Emmanuel Macron delivers his new year’s wishes during an address to the nation from the Élysée Palace, in Paris. Photograph: Stephane de Sakutin/AFP via Getty Images

France is overhauling its Covid-19 immunisation campaign after a cautious, phased strategy aimed at placating the world’s most vaccine-sceptical popul(...)

Pfizer has said it is asking US regulators to allow emergency use of its Covid-19 vaccine. File photograph: Justin Tallis/AFP/Getty Images.

Pfizer has said it is asking US regulators to allow emergency use of its Covid-19 vaccine. The move could deliver a limited amount of first shots of (...)

Dr Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases  in the US, said people should not assume a change in the weather will limit the spread of the coronavirus. ‘You must assume that the virus will continue to do its thing,’ he said. Photograph: Al Drago/The New York Times.

This is a series of regular updates from Irish Times Environment & Science Editor Kevin O’Sullivan on scientific initiatives and developments on c(...)

Cannabis users congregate at Trinity Bellwoods Park for a 'smoke out' on October 17th, 2018, in Toronto, after the legalisation of the drug. Photograph: Ian Willms/Getty Images

During a trip to Canada earlier this year, I wasn’t quite sure what to expect. Having enacted the Cannabis Act in October 2018, which legalised cannab(...)

Researcher He Jiankui claims to have altered the DNA of the twins to try to make them resistant to infection with the Aids virus. Photograph: Anthony Kwan/Bloomberg

China’s government has ordered a halt to work by a medical team that claimed to have helped make the world’s first gene-edited babies. Vice-minister (...)

Recently retired Irish rugby player Sophie Spence said: “Forming the habit of regular exercise at an early age is crucial to maintaining and improving your fitness levels throughout your life.” File photograph: iStockPhoto

A major new study indicates there is a “startling drop-off”in fitness among secondary school students after the Junior Cert. The results of a study (...)

Somebody tries to revive a man who overdosed on heroin in the Kensington section of Philadelphia, a hub for heroin addicts. Photograph: Spencer Platt/Getty Images

American politicians and scientists are issuing strident warnings to policymakers in Europe and around the world, urging them to prevent an epidemic o(...)