21 October 2015 marked the day in Marty McFly's future which he travelled to in Back to the Future II. The trilogy of films, first released 34 years ago in 1985, are some of science fiction's most loved time travel stories. But is time travel possible? And is the future everything it's cracked up to be?
What differences do you see between Marty McFly's future and our present? What leaps in technology could you not have imagined even a few years ago? Discuss your views on the future of 2015 in the comments below.
How can the history of ideas and philosophers from the past influence the way we think about the future?