What is race?

Its funny when you look at race. Some of you I bet ask yourselves what race so and so is when you walk by them in the halls at school. But in the end does it matter. Yes back before Brown V. Board of Education it did matter, but now it doesn't. I want to know who makes you black and what makes you white? Derek Jeter arguably one of the biggest athletes of his time is mixed but he has never answered the question is he white or black and should that matter? He is a human being and everyone should be looked at the same.