 Sarah Everts wrote the book on the history of sweat. She's not surprised full-body products are popular, but questions whether they're necessary. You might as well just wear perfume and try and complement your body odor. Whether driven by ads or by real need, it's clear more bodies are using it. Do you think there's more room to grow here? We see lots of opportunity. Inspiration from perspiration as more companies promise to stop the stink. Bradley Blackburn, CBS News.