Second, even without glare they selectively reduce other reflections from objects above water, including clouds and even the sky (the reflected sky gives most of its blue color to the sea). Finally, light coming from under water is slightly polarized in the vertical plane (polarized on transmission).
1 Alzheimer's is the sixth leading cause of death in the United States. 2  Those with Alzheimer's live an average of eight years after their symptoms become noticeable to others, but survival can range from four to 20 years, depending on age and other health conditions.
Around 500,000 people die in England each year, and it is predicted that this will rise to 590,000 within the next 20 years. Heart failure and stroke are the biggest killers. One in four people in the UK will die of cancer. With an increasingly ageing population, the majority of older people will be living with a number of conditions. For example, around 30% of people over the age of 85 with cancer will also have dementia.