When an electric current passes through a metal wire, a magnetic field forms around that wire (see diagram at right). Likewise, a wire passing through a magnetic field creates an electric current ...

Would a dramatic change in the Earth's magnetic field affect creatures that rely on it during migration? Late on a January night in 1993 I found myself on a beach on the Pacific coast of Costa ...

Over the years, they’ve been able to deduce that sea turtles navigate using Earth’s magnetic field—as though they have a built-in GPS system. But scientists have never understood exactly how ...