06:25 Earth and Space Science Carl Sagan on the Existence of Extraterrestrials Lesson duration 06:25 657,650 Views
10:52 Philosophy Ralph Waldo Emerson and the Beauty of the Everyday Lesson duration 10:52 1,122,536 Views
04:43 Science & Technology The Turing test: Can a computer pass for a human? Lesson duration 04:43 1,710,827 Views
05:21 Literature & Language The controversial origins of the Encyclopedia Lesson duration 05:21 463,713 Views
04:16 Design, Engineering & Technology The ethical dilemma of self-driving cars Lesson duration 04:16 2,136,058 Views
04:35 Thinking & Learning Can you solve the prisoner hat riddle? Lesson duration 04:35 31,392,123 Views
04:42 Philosophy & Religion Can you solve the famously difficult green-eyed logic puzzle? Lesson duration 04:42 15,794,129 Views
03:55 Social Studies Mansa Musa, one of the wealthiest people who ever lived Lesson duration 03:55 8,144,941 Views
