41. Marked variations within a species are not uncommon; brain size varies within living humans by abut 15 percent. 42. There is so much variation in brain size that we all overlap in brain size with other population groups, 43. There is so much variation in brain size that we all overlap in brain size with other population groups, 44. They sported a very small brain size in proportion to their body, second only to the Saurischian sauropods. 45. That implies that these larger animals could be significantly cleverer for a relatively small percentage increase in brain size . 46. Indeed, they consider the dinosaur's brain size decisive evidence that it had what it took to fly. 47. Cro-Magnon man, scientists say, was a lot like us, in brain size and other ways. 48. Allometric analysis indicates that mammalian brain size scales at approximately the T ! or ?exponent of the body mass. 49. Thus, the percentage of gray matter appears to be more related to brain size than it is to sex. 50. Humans appear to differ from chimpanzees in the ways we think more than we differ in brain size or speed.
