Urgent security update

support:

Bad news: A major vulnerability has been disclosed for the technology that powers encryption across the majority of the internet. That includes Tumblr. Our team took immediate action to fix the issue, but you should still take some time to change your password, not only here but on any other sites you visit. 

You should also strongly consider enabling two-factor authentication. It’ll go a long way to ensure that no one besides you can access your account. Thanks, and take care.

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visualizingmath:

Mathematical Object Minimalist Posters by Visualizingmath(Yes, I actually attempted to make something!)

Thank you to Curiosamathematica for creating the Klein Bottle image!

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