Upphovsland: USA
1. The World Beneath Our Feet
Avsnitt 1 - The World Beneath Our Feet, Säsong 6
Humanity has launched satellites into outer space and submarines to the ocean floor, but the ground below Earth's surface remains shrouded in mystery.
2. The Time Travelers
Avsnitt 2 - The Time Travelers, Säsong 6
A look at whether time travel has already occurred, on purpose or by accident, and scientists who believe it is theoretically possible.
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