Scientific POV: Having 8x the evolutionary timeframe of cooking with fire is certainly a better explanation as to why Hominids have relatively shorter digestive tracts.

Author Feedback: The "animate an article with static pictures with text scroll-over" was really neat when it first debut'd, but at this point you guys need to keep site designs much simpler. I shouldn't have to physically wheelscrool 8x as much to read the same amount of text.

400,000 years ago, based on items that were likely known/used far earlier