Peppers come in a wide variety of flavors and range of heat. Although all peppers are in the nightshade family and contain capsaicin, they range from sweet (very low capsaicin) to extremely hot (high capsaicin). In fact, a solution made from habanero peppers is used to remove barnacles from ships. But let's put an old wives' tale to bed right up front. For years, the rumor has abounded that nightshades are poison and should be avoided. While that may be true for a few members of the nightshade family (tobacco is the first that comes to mind) it is most certainly not true for vegetables like...