The notion that every dog or cat should be neutered at 6 months isn't based on evidence, says veterinarian Brennen McKenzie, author of The SkeptVet blog. It depends on the breed and other factors. Talk to your vet, he advises, about pros, cons and timing. katoosha/iStockphoto/Getty Images hide caption
Science-based guidelines say there's no benefit to getting an EKG of heart activity before routine cataract surgery — even if the patient is old. But most doctors order such tests anyway. Bull's Eye/ImageZoo/Corbis hide caption
A meeting of Alcoholics Anonymous in the 1950s was based on much the same 12-step program used today. Bettmann/Corbis hide caption
The physical therapist will advise, but you're going to have to do the work. iStockphoto hide caption