by Mariëtte Le Roux PARIS, France (AFP) — Soaring rates of population growth and ageing have long been seen as portending a global explosion of Alzheimer’s, the debilitating disease that robs older people of their memory and independence. But an unexpected, and hopeful, trend may be emerging. In rich countries at least, recent data suggests the rate of new cases has slowed or even reversed — a tantalizing hint that quality-of-life improvements may protect against […]