The massacre in Paris, following bombings in Beirut, Lebanon, and the downing of a Russian passenger jet over Egypt, all claimed by the Islamic State, reveals a terrorist organization that has changed in significant ways from the West’s initial understanding of it. Photograph: Reuters

Defying Western efforts to confront Islamic State on the battlefield, the group has evolved in its reach and organisational ability, with increasingly(...)

Long-term shift work has an ageing effect on the brain that leads to an impaired ability to think and remember, a study has found.

Long-term shift work has an ageing effect on the brain that leads to an impaired ability to think and remember, a study has found.A decade or more wor(...)