"the average lifespan of a web page is 100 days, bookmarking a page [..] is not a great plan for saving information" https://blog.archive.org/2013/10/25/fixing-broken-links/
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Test code is total: we require it to always terminate or it's a failure! It also typically has 100% line and branch coverage.
I feel way less nervous about refactoring tests, you can always just run them.
Amazing blog post about running a modern Linux kernel on Chumby hardware, investigating bad CPU numbers from top, and finding a Linux kernel bug from 2009!
OSS components are so common in software stacks now. It might be an interesting exercise to try to build a e.g. a web service with 100% proprietary components.