The future is certain, it is the past that changes. Moveon had a web page demonizing General Petraeus as General Betray Us Obama appoints General Petraeus in charge of Afghanistan, whereupon the page not only instantly disappears from Moveon.org, but also instantly disappears from Google’s cache. When the past changes, Google’s spiders are quicker of the mark than they are for normal updates, suggesting human intervention to correct the past …