http://www.the-scientist.comhttps://cdn.the-scientist.com/https://cdn.the-scientist.com/assets/image_not_found.jpg/ What's in Your Milk The hypothesis: Steroid and peptide hormones in milk increase the risk of cancer. IVAN ORANSKY sifts through the data to find the truth. http://www.the-scientist.com/2007/2/1/20/1/ The cow whisperer http://www.the-scientist.comhttps://cdn.the-scientist.com/https://cdn.the-scientist.com/assets/image_not_found.jpg/ Dairy economics: Milking blood from a stone http://www.the-scientist.com/2007/2/1/40/1/ Milk and human health: What's the state of the evidence linking milk to human disease? http://www.the-scientist.comhttps://cdn.the-scientist.com/https://cdn.the-scientist.com/assets/image_not_found.jpg00/ Slideshow: From feed to bottle http://www.the-scientist.com/2007/2/1/38/1/ Infographic: Selected milk components and their concentrations

Gary Rogers is driving down a highway in Tennessee pointing out the dairy farms and cows that dot the landscape. He has a bit of data that a Northeast city dweller finds eye-opening: "All of the black and white cows around the world are related, and I don't mean 500 years ago," he says. In fact, today, most of the nine million dairy cows in the United States share just a handful of paternal grandfathers.

That has resulted in intense...

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