Whenever I watch a television commercial or read about a new product making amazing claims about how a new medicine or kitchen gadget will change my life, I find myself asking “Does it work?” I read reviews, reach out to friends who have tried it, or just buy it to see if the hype is real. Usually, I find that the answer to the “does it work?” question is “sort of.” Arthritis miracle cures sort of relieve pain. Weight loss miracles sort of shrink my waistline. Kitchen tools kind of perform as advertised. The simplest solution to the question of whether or not a product or practice works is try...