Watch LaterAdded 05:32 說地方與人 How did Polynesian wayfinders navigate the Pacific Ocean? – Alan Tamayose and Shantell De Silva
Watch LaterAdded 03:35 歷史性發明 How did trains standardize time in the United States? – William Heuisler
Watch LaterAdded 05:07 身體的科學 How do germs spread (and why do they make us sick)? – Yannay Khaikin and Nicole Mideo