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Someone's probably working on an eBook app where, if you stop reading right before some plot twist happens, the app will wait a while and then send you a breaking news alert about what's happening, prompting you to open it and read the next few pages to learn more.

What If? is now on YouTube!
Check out the first video for the answer to
“What if we aimed the Hubble Telescope at Earth?”
and follow xkcd’s What If? The Video Series channel to be notified about each new video.