The first ever 'If Conference 2011' has been and gone - and what a conference it was. Over two days it became a buzzing, zinging mating-ground for ideas, with the stars of future-gazing thrilling and teasing all with enlightenment and possibility. To get you started, we've chosen a clip from Sarah Harper's talk on extreme longevity. Sit back, and enjoy!

There were talks on everything from vertical gardening, to endless cities, from 'mind change' to the coming revolution of 3D printing. So, of you fancy checking out a few more, click here.