All American Rolling Shutters completely block out all light when closed. They can be used to keep out light when sleeping, or eliminate glare when watching television. Sun control may be the biggest benefit of rolling shutters in Colorado due to the intense sunlight and UV ratings. When closed, rolling shutters block out all of the sun's light, and Colorado's intense UV rays and most of the heat. As energy costs rise, the savings can be substantial.
Everything there is to know about propolis. Propolis is a 100% natural, antimicrobial substance made from plant resins, which is collected by honeybees (Apis mellifera) along with the nectar and pollen they need for food. It is also known as 'bee glue' and sometimes as 'hive dross'.
While promising, the results of these studies are preliminary. (Some of the studies were too small and too poorly designed to yield significant findings.) However, propolis does have proven antibiotic and antiseptic properties and may also have antiviral and anti-inflammatory effects. I consider it safe and useful as a home remedy. You can find it in various forms in health food stores or get the raw stuff from beekeepers.