Your comment is missing that * fire is a very powerful weapon, at the same time it will weed out the ones unfit to control it * energy from the outside means

Your comment is missing that * fire is a very powerful weapon, at the same time it will weed out the ones unfit to control it * energy from the outside means less calories need to be burned on the inside. * cooking kills pathogens, I'm not sure that may be included in the 5x account Still one has to wonder whether the discovery was dependent on language, and whether language and social competition was a bigger boost to brain size.