L'effet Doppler
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From a channel a BrighterTube curator vetted · found via Round 4 discovery (unsure list, re-vetted by transcript) · 85% confidenceFrom a channel Lumen includes in full after transcript vetting: Step-by-step physics explainers like General Relativity geodesics lecture series.
A 2-minute video from ScienceClic's catalogue; the title names its topic.
Video by ScienceClic, played through YouTube's embedded player.