Comments by "eDoc2020" (@eDoc2020) on "Retroreflectors; they're everywhere, and they cheat physics (sort of)" video.

  1. Retroreflective beads are also in many projector screens to improve contrast. It reflects lots of light to somebody in the same direction as the projector but doesn't reflect as much from the room lights.
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  2. That happened with my family's new car. On every previous car the dash only lights up when the headlights are on, and the new car also has DRL. Combine the two and it is hard to notice if you accidentally left the lights off.
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