I agree that the mainstream media lie almost all the time. However, that doesn't mean everything they say is wrong or a lie. Sometimes the truth slips through. For example, the New York Times actually reported on rampant pedophilia in New York Jewish communities (even orthodox ones) several years ago. Just because they lie about everything else doesn't mean they were lying, or wrong, then. To suggest otherwise would be to slip into the "well Hitler drank water" meme. In general, though, extreme caution should always be used with any source from the mainstream. They're known liars.

Furthermore, just because we don't have the skulls of everyone that ever lived doesn't mean we can't do comparative analysis of the skulls we have. Even using a small fraction of the skulls available, we can determine averages and see trends. I've heard that info before that ancient humans lost their teeth over time due to their diet. However, that doesn't disprove what I posted. They could have a much higher average (per capita) of straight and healthy teeth, but due to eating more veggies, which would be washed less and contain more dirt than veggies today, and would chew on more bones for marrow, would grind down their teeth more (even though their teeth were on average healthier).