Gender

There are a lot more gender similarities then there are differences however it doesn't seem that way because everyone seems to focus on the differences. Intelligence variation in males verse females is minor and are in a wide variety of subjects. Males are better at some things while females are better at others. The subjects you would probably have guessed. Females excel in English while males are better at solving math problems.
These petty differences don't tell you much because like i said before you have to focus more on the individual then anything else. Honestly i don't like it when people stereotype and point out the differences of people. Just because it's an average everyone is not average! This kind of stuff leads to employers choosing employees based on race and gender. Facts show that males have a better aptitude for math so if this is publicized, like these kinds of findings usually are, then most jobs dealing with mathematical computation will go to a male.
Gender differences are prevalent but not reliable enough to base anything on. They are interesting however not important. The same with ethnicity differences. Like i have said and will always say it's all about the individual.