Before taking it, I was unaware that the largest difference in life expectancy observed between counties in the United States was 15 years. I was amazed that just being born in a different zip code could have such an impact on life expectancy. This deeply supports the conclusion that the environment affects health. Health expert Michael Marmot found that a subway ride from a poor African-American neighborhood to an affluent white Washington, D.C. suburb led to an average increase in life expectancy of a year and a half for every kilometer traveled, totaling up to twenty years. We cannot control the neighborhood in which we are born, and it is surprising that such an uncontrollable factor can affect longevity so much in an industrialized country like the United States ("Health equity quiz", 2008). I was particularly surprised to find that in West Los Angeles, white neighborhoods have nearly 19 times more green space than black and Latino neighborhoods. White neighborhoods have nearly 31.8 acres of green space per 1,000 residents, while minority neighborhoods have only 1.7 acres of green space (“Health equity quiz,” 2008). When traveling to Las Vegas, you will find parks in almost every neighborhood. While there are likely more parks in wealthier areas, we don't see as big a gap in our numbers – or so it seems. Seeing that a city as populous as Los Angeles treats its residents so disproportionately was