捐血

• Plastics: What’s Recyclable, What Becomes Trash — And Why
• How to Help Teenagers Keep Track of Their Stuff – The New York Times
• The Great Fortune of Ordinary Sadness – The New York Times
• Think Your Aging Parents Are Stubborn? Blame ‘Mismatched Goals’ – The New York Times
• It’s never too late to start exercising, new study shows — ScienceDaily

時間：五分五十四秒。