New series BBC1 on sunday evening. Time lapse geology basically. quite interesting, especially the bit that explained the yellowstone national park is the top of one of earths largest volcanoes.It blows its top every 600,000 years or there abouts without fail.It last erupted 630,000 years ago! were overdue a major eruption which will cover over 50% of north america with lots of volcanic debris and give the rest of us a few problems too. :chill: