In the past, curbside recycling programs mandated that caps on plastic bottles be taken off before being tossed into the bin. The reason? The type of plastic in caps is different than the plastic used to make bottles. But new technologies and advancements in recycling have made it possible to leave caps on bottles so both can be recycled. Just remember to ask your trash collector if their policy on recycling bottle caps has recently changed. You may be surprised to find out it has changed for the better.