Cosmologist Sean Carroll assesses God as a scientific theory, discusses physicist Don Page's theological argument for the Everettian multiverse, and asserts his own belief that the underlying physics of everyday experience has been fully explained.

How European robins may exploit quantum effects to sense the Earth's magnetic field. Reporter Carinne Piekema talks to Simon Benjamin and Erik Gauger.

The way we choose to mark time in the early universe could profoundly change the fundamental laws of physics we measure. Physicist Andreas Albrecht discusses his research and whether it means we'll never find a unique theory of everything.