Watch LaterAdded 07:53 相對論前後 String theory and the hidden structures of the universe – Clifford Johnson
Watch LaterAdded 55:41 科普演講RoI Studying Saturn: The Legacy of the Cassini Mission – with Michele Dougherty
Watch LaterAdded 05:39 說地方與人 The Atlantic slave trade: What too few textbooks told you – Anthony Hazard
