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Sources

Every claim in our films, and where it comes from.

5 videos · 140 sources · Updated 26 Oct 2026

5 videos

  1. The lighthouse keepers who vanished from Flannan Isles

    · 0 sources

  2. The day a wave of molasses swept through Boston

    · 11 sources

  3. Why Roman concrete is still standing and ours is cracking

    · 6 sources

  4. Tunguska, 1908: the explosion that flattened 80 million trees and left no crater — and the eighty years of expeditions, theories and arguments that followed

    · 3 sources

  5. Krakatoa, 1883: the eruption the whole world read about

    · 120 sources