Clocks

22nd February 1999 44 mins Season 6 Episode 18

Does anybody really know what time it is? Set your clocks as we explore the relativity of time from antiquity–when man attempted to chart time with methods ranging from shadows, candles, and water–to today’s atomic clock system–accurate to within one second every two-million years.

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Season 6 · Episode 19

Airships.

First there were balloons and blimps. Then, visionaries enlarged, reinforced, and motorized them and the airship was born. The biggest aircraft ever flown, they remain one of the most romantic aerial creations. In all, 161 rigid airships were built before spectacular crashes, including the EM Hindenburg /EM , put an end to the era.

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