A number of factors can lead companies to close stores. One is mergers and acquisitions activity. As organizations join forces under a single umbrella, locations that once competed for sales can become redundant, leading to store closings.
There are 3 types of ultraviolet (UV) rays: 1  Ultraviolet A rays (UVA) make up most of the sun's natural light. They can penetrate deep into the skin, causing wrinkles and premature aging of the skin.  Ultraviolet B rays (UVB) are the main cause of sunburn. They are nearly 1,000 times stronger than UVA rays.
I can't see through my skin, but x-rays can easily pass through me, and gamma rays can fcking melt my brain and such. What accounts for the fact that both long-wavelength waves (radio) and short-wavelength waves (x-rays, etc.) can pass through solid objects, but medium-wavelength waves (visible light) cannot?