Some people never forget a face. For the rest of us, recognizing faces is not so easy. And those with prosopagnosia can’t even recognize their close friends. Now scientists say the ability to recognize faces is inherited and separate from general intelligence or IQ. IQ is strongly heritable. And one longstanding general thought about IQ holds that if you’re smart in one area, you’ll... 

What Works Color works. It helps that in this case, the characteristic being mapped is eye color, so it’s kind of a no-brainer to shade the areas where blue eyes are prevalent in blue and the areas where brown eyes are prevalent in brown. Even if this graph were to be printed in a grayscale journal (which is probably why the one on the left tries to use hatching to distinguish the areas), using degrees...