tomalator

tomalator t1_j1qd532 wrote

If you look at your headphone jack, you may notice there are black rings on it. Those rings separate different channels. One ring means only one channel (one channel and ground). Two rings means you have 2 channels (left, right, and ground) and 3 rings means there's an additional channel for a microphone.

Sending different signals down the different channels means each speaker plays a different sound. By changing the relative volumes (and timings by a very small amount) our brains are tricked into thinking the sound is coming from a certain point in space, including moving from one side to the other.

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tomalator t1_iuarh9p wrote

Assuming it has been in the freezer long enough to completely freeze, it shouldn't make a difference. If I have 2 ice cube trays and I put one in the freezer for an hour and the other in front day, the ones that were in there for an hour haven't completely frozen yet, and will therefore melt faster, but if I instead compare ice cubes that were in the freezer for a day and a week, both had enough time to completely freeze and there shouldn't be a difference.

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