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IRENE ROJAS/MissourianRock Bridge High School student Erin Greer said she wears flip-flops daily when the weather is warm despite warnings from doctors that the footwear poses health risks because ofIRENE ROJAS/MissourianRock Bridge High School student Erin Greer performs an experiment Thursday in which she walks in flip-flops and sneakers to see which requires more steps to cover the same amount