To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I do the daily crossword puzzle and sudoku every morning, I was finding it hard to remember things I knew well. After trying prevagen words would immediately come to mind. I really love it and what it does for my memory.