Results come from Exumo's own index. Data from YouTube; Exumo is not affiliated with YouTube.

1. 13:43

   Black Holes from the Dawn of Time

   PBS Space Time · Oct 12, 2016 · 1.1M views

2. 6:22

   Are We Alone? Galactic Civilization Challenge

   PBS Space Time · Oct 5, 2016 · 467.5K views

3. 13:09

   Life on Europa?

   PBS Space Time · Sep 29, 2016 · 1.3M views

4. 14:03

   Quantum Entanglement and the Great Bohr-Einstein Debate | Space Time | PBS Digital Studios

   PBS Space Time · Sep 22, 2016 · 2.6M views

5. 12:54

   Self-Replicating Robots and Galactic Domination

   PBS Space Time · Sep 14, 2016 · 795.8K views

6. 8:22

   Is There a Fifth Fundamental Force? + Quantum Eraser Answer

   PBS Space Time · Sep 7, 2016 · 972.9K views

7. 14:31

   Should We Build a Dyson Sphere? | Space Time | PBS Digital Studios

   PBS Space Time · Aug 24, 2016 · 2.6M views

8. 5:53

   Quantum Eraser Lottery Challenge

   PBS Space Time · Aug 17, 2016 · 409.7K views

9. 14:40

   How the Quantum Eraser Rewrites the Past | Space Time | PBS Digital Studios

   PBS Space Time · Aug 10, 2016 · 2.8M views

10. 13:27

    Can We Survive the Destruction of the Earth? ft. Neal Stephenson

    PBS Space Time · Aug 3, 2016 · 573.1K views

11. 13:32

    The Quantum Experiment that Broke Reality | Space Time | PBS Digital Studios

    PBS Space Time · Jul 27, 2016 · 7.1M views

12. 8:20

    The Future of Gravitational Waves

    PBS Space Time · Jul 20, 2016 · 325.5K views

13. 13:27

    Juno to Reveal Jupiter's Violent Past

    PBS Space Time · Jul 6, 2016 · 528.8K views

14. 4:21

    Nuclear Physics Challenge | Space Time | PBS Digital Studios

    PBS Space Time · Jun 29, 2016 · 159.8K views

15. 15:16

    Planck's Constant and The Origin of Quantum Mechanics | Space Time | PBS Digital Studios

    PBS Space Time · Jun 22, 2016 · 2M views

16. 13:32

    The Strange Universe of Gravitational Lensing

    PBS Space Time · Jun 15, 2016 · 935.7K views

17. 13:44

    New Fundamental Particle Discovered?? + Challenge Winners!

    PBS Space Time · Jun 8, 2016 · 941K views

18. 11:07

    Is Quantum Tunneling Faster than Light? | Space Time | PBS Digital Studios

    PBS Space Time · Jun 1, 2016 · 1.7M views

19. 15:28

    Is an Ice Age Coming? | Space Time | PBS Digital Studios

    PBS Space Time · May 25, 2016 · 4.9M views

20. 14:48

    Anti-gravity and the True Nature of Dark Energy | Space Time | PBS Digital Studios

    PBS Space Time · May 18, 2016 · 2.2M views