With nearly two million members and $12.8 billion invested in KiwiSaver, nzherald.co.nz is launching a four-part video series about the retirement savings scheme. Five years since it kicked off, KiwiSaver is still a mystery to many New Zealanders and we decided to provide a simple guide which covers the nuts and bolts. Experts Mary Holm and Chris Douglas tackle all the basic questions in a way which is easy to understand and jargon-free.