Old or broken drinking glasses. Burned-out incandescent light bulbs. Empty prescription-medicine vials. These are on an increasingly shortlist of common waste items that we can't put in our residential curbside recycling bin.   They are the unrecyclables.   That sounds almost criminal, doesn't it? Recycling has become so ingrained here in the Seattle area that we now expect to be able to recycle everything. When we can't recycle something, we want to know why.   Q: How about plastic or foil candy wrappers and chip bags? A: No municipal residential-recycling programs accept these. Some Seattle-area schools and nonprofits collect candy and snack packaging through programs offered by New Jersey-based TerraCycle, a for-profit company. TerraCycle funds these recycling programs through promotional partnerships with brands such as M&M's. Recyclability isn't everything. Reducing and reusing trumps recycling. But recycling certainly beats landfilling, and if a product or packaging is only "technically" recyclable, that doesn't help consumers. We're most likely to recycle when it's as easy as throwing something away.