Something that causes a response in a body part or organism. A stimulus may be internal or external. Sense organs, such as the ear, and sensory receptors, such as those in the skin, are sensitive to external stimuli such as sound and touch.
Just curious...given my insurance plan I can get a new pair of frames and lenses once every 2 years, but I realllly love glasses so I tend to purchase about 2 pair per year...Gotta have my style...oh and of course the added benefit of sight is a nice plus:)
how much water should i drink every day? The National Academy of Sciences recommends drinking about 11 cups of water per day for women and 16 cups a day for men.[3] But this number can vary based on lifestyle, body size, and other factors. If you're active, you'll need to increase your daily water intake.