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Neil deGrasse Tyson on Surviving in Space without a Spacesuit
Lesson duration 03:05
284,983 Views
¿Qué le da el valor a un billete de dólar? - Doug Levinson
Lesson duration 03:52
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¿Qué nos enseñaron los perros sobre la diabetes a los seres humanos? - Duncan Fe
Lesson duration 03:48
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The incredible collaboration behind the International Space Station
Lesson duration 04:58
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193,934 Views
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