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 Some brains seem to defy Alzheimer's. Even when the disease's telltale plaques and tangles are present, certain individuals remain mentally sharp well into old age. This phenomenon, known as cognitive resilience, is one of the most intriguing puzzles in neuroscience today.
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 Amazon this week is taking $50 off Wi-Fi models of Apple's 11th generation iPad. Prices start at $399.00 for the 128GB Wi-Fi iPad, down from $449.00. This is now the best price we've seen on the iPad since Apple's price hikes in June.
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