Last Updated: Monday, 13 June, 2005, 15:47 GMT 16:47 UK From birth through to death our brains will file away huge amounts of information - facts, names, faces, sounds, smells and events and the emotions that are inevitably tied to them. But what is memory? How does it work? In this four part series, Pam Rutherford will explore the science of memory, its extraordinary capabilities, how and why it