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Gmail Labs includes a ton of pet projects that various employees thought might be neat. Hence why they're Labs products.

I kind of like it when they implement stuff like that, just because it's fun.

I bet the next thing we'll see is random signatures.

If you try to actually turn this on in your Gmail settings, you will scroll past their random signature option.

i thought that this was an April fool's joke

There was a similar one. I think it involved time travel instead of answering math problems, though.