Mark Blegen

Good Question: Are Athletes Born Or Built?After watching Venus and Serena Williams battle out a great tennis match Tuesday night, you have to wonder: How can two sisters be so good? How much is genetics and how much is practice?
Good Question: How Far Can We Push Our Bodies?On Monday afternoon, 64-year-old Diana Nyad finally accomplished something she'd attempted five times over the past 35 years: swim without a shark cage from Cuba to Florida.