Neil MacGregor continues his series on the expression of shared beliefs in communities around the world and across time. He focuses on the natural world and seasonal change: the Yupik people of Alaska depend on the seal, and ancient Egyptians looked to the god Osiris to bring fertility to their arid land. Both societies, in radically different climates, devised practices that acknowledged the fact of their dependence on the natural world - and engaged everybody with the responsibility of co-operating with it.

Producer: Paul Kobrak

The series is produced in partnership with the British Museum