- Original release
- Previous episode S2013E638 - Why do we see illusions? - Mark Changizi
- Number S2013E639
- Genres Animation, Children, Documentary, News
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External links
TheTVDB page
IMDB page
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Last update
12 février 2026 - 21:15
on 11 databases
Euclid's puzzling parallel postulate - Jeff Dekofsky
Next episode
S2013E640 - TED-Ed YouTube Channel Teaser
