Was ist Zeit? - Das ewige Rätsel
- Genre: Documentary, TV Movie
- Studio: China Media Group, ZDF, ZDF Studios, ARTE, CCTV-9
- Keyword: time travel, time machine, primitive time, paradox, time freeze , social documentary, alternate timeline, perception, time paradox, time line, space time, history of mankind, time displacement, time dilation, science documentary
- Cast: