“I feel like my memory’s getting worse. It’s a placebo effect (安慰剂效应)  – or it’s taking place!” Chris Hemsworth said to Vanity Fair. In November, the Australian actor was told that he had rare genes (基因) that may lead to a higher risk of Alzheimer’s disease while filming the National Geographic documentary Limitless (《挑战极限》). After thinking about what is important in life, the 39-year-old decided to temporarily retire from public life and spend more time with his family.