Watch LaterAdded 05:23 心智之重要 TED What causes panic attacks, and how can you prevent them? – Cindy J. Aaronson
Watch LaterAdded 06:45 事物科學 What can DNA tests really tell us about our ancestry? – Prosanta Chakrabarty
Watch LaterAdded 06:15 事物科學 Which is better: Soap or hand sanitizer? – Alex Rosenthal and Pall Thordarson
