Animal Planet's "Monsters Inside Me" host Dr. Dan Riskin is stirring up the airwaves with the truths about nature's ugly side. No wonder he is so entertaining. Maggot eggs got into his brain, and he lives to tell you why parasites really rule the world.

Sara Bennett's family business, Navarro Vineyards, uses tiny sheep to keep the weeds under control. But that's not the only thing they do. Hal asks hard-hitting questions like, "What sound does a sheep make … and isn't that the same sound as a goat?"

The second phase of clinical trials for a new vaccine is done, and the results are very promising. If it's successful, you'll take just four doses over 12 weeks to keep your cat allergies at bay for as long as two years.

A dog's sense of smell is said to be 200,000 times better than humans. That's why dogs work detecting bombs and drugs, and now they're being trained to use those fantastic noses to detect certain health issues, like the moment a person with diabetes starts to have a hyperglycemic incident. Now, researchers at a UK charity, Medical Detection Dogs, are working on training dogs to detect the odor of cancer.