Watch LaterAdded 05:08 事物科學 How the COVID-19 vaccines were created so quickly – Kaitlyn Sadtler and Elizabeth Wayne
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