Just as a leaf drifts along with a stream, objects in other moving fluids normally drift along with the flow. That is, unless they exert energy to move against it. Although it may be less intuitive, ...

Andrew Robinson is editor of The Scientists: Pioneers of Discovery, and author of Einstein: A Hundred Years of Relativity, among other books. The ‘ten-year rule’ of creativity and genius, identified ...

"My head's always full," says mum-of-three Stacie Matthias. "I go to sleep with a mental to-do list." She's talking about the concept of the "mental load" - the burden of planning, organising, ...