11:32 Macroeconomics How state budgets are breaking US schools - Bill Gates Lesson duration 11:32 56,487 Views
04:50 Technology Illuminating photography: From camera obscura to camera phone Lesson duration 04:50 482,992 Views
12:29 Value of the Arts How art gives shape to cultural change - Thelma Golden Lesson duration 12:29 104,126 Views
04:22 History How to find the true face of Leonardo - Siegfried Woldhek Lesson duration 04:22 103,788 Views
04:19 Science & Technology Solving the puzzle of the periodic table Lesson duration 04:19 1,142,361 Views
