The_quest_for_wisdom t1_j5i4j48 wrote on January 23, 2023 at 3:52 AM

Reply to comment by Rossum81 in 66% of multi-billion dollar movies have featured Zoe Saldana painted blue or green by Thalesian

Her effect on box office returns only works because we all believe it works.

The_quest_for_wisdom t1_j2e3wkw wrote on December 31, 2022 at 4:12 PM

Reply to comment by GanondalfTheWhite in Eli5 How exactly does Noise cancellation work? That too in such small airbuds by Professional-Ad3441

We assume the speed of sound is much faster than it is. Locally it seems almost instantaneous, when it is not.

If you have a large bell like the kind used in a church steeple you can see this disconnect with your own eyes.

If you get more than about an eighth of a mile away you will see the ringing bell move quite a bit out of sync from the sound of the bell ringing that you hear.

It gets even wielder when you consider that the image of the bell being rung is also arriving in your eye AFTER the bell is actually being rung, due to the speed of light. It's just a much shorter delay.

It might be tempting to just hand wave that away and say that the light travels effectively instantaneously, but that thinking with sound is exactly how we ended up here in the first place.