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Here’s something I’ve never understood; perhaps a more knowledgeable commenter can explain it to me.

If I get in a spaceship and accelerate up to about 0.9c, then cruise for a while, then flip around and come home at the same speed, I will have experienced much less time than the people on Earth. But from my frame of reference, they were the ones going really fast, and I was sitting still. If all motion is relative, what makes me the one to experience less time?


This is a well known paradox: https://en.wikipedia.org/wiki/Twin_paradox

TL;DR: The two scenarios are not symmetric, the person in the spaceship undergoes acceleration whereas the observer staying behind does not.


As a fourth-year returning volunteer, I strongly agree with all of this!


Sorry about this bug! We're working on a fix now.

Definitely one of the biggest challenges in building this product is getting the annotation interface to work consistently in a “host page” environment over which we have pretty much no control or advanced knowledge. So for instance, the jump-you-to-the-top bug isn't something we've seen in the general case; we're currently getting to the bottom of why it's happening on this particular page.


I noticed it happened on the last annotation that was at the edge of the screen. It looks like you position the annotation box at this height. That might have something to do with it.

Also, after a long piece of annotated text its annoying that the box pops up at the very bottom of the text rather than side by side.


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