Tobi Lehman's blog

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Thing explainer in emacs

This is my first major mode for emacs. It was inspired by Randall Munroe’s Thing Explainer and Morten Just’s editor that doomed humanity. The concept is simple, restrict your vocabulary to the 1000 most common words. If you can explain something using this reduced vocabulary, then you really understand the topic. This is a decent test of understanding because it’s easy to learn a word, and even use that word in the right context, but still have no idea how it relates to other things. Read more...

Dockerize all the things

Okay, maybe not all the things, but the things that tend to litter your filesystem with libraries, dependencies and other crap that increases the chances of a conflict. If you are not familiar with Docker, check it out, then come back here and troll my flaming fanboy drunk on kool aid ravings in the comments. I write a lot of ruby and python code, and I also use a lot of ruby/python and javascript code other people wrote as well. Read more...

New largest Mersenne prime found

The largest prime number was just found, and it is a Mersenne prime, or a prime number of the form 2n - 1. As of January 2016, 274,207,281 - 1 is the largest known prime. Primes are interesting in their own right, but they also are indispensible in cryptography. We’ve known since Euclid that the number of primes is infinite, but it is still an open problem whether the number of Mersenne primes is infinite: Read more...

Set up Mailinabox with LetsEncrypt

If you are not familiar with the EFF or their great project LetsEncrypt, don’t feel bad, even the CEO of T-Mobile doesn’t know. But seriously, this post is about combining the best of two projects: Mailinabox a standalone mail server that enables email as it should be LetsEncrypt a non-profit TLS certificate authority Mailinabox allows anyone with little patience to set up their own mail server with all the fixings, web client, spam filter, admin panel, etc. Read more...



Computer programmer and amateur mathematician. Lives in rainy Portland, Oregon, United States. Read more


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