Broken link from 

<http://250bpm.com/>

current leads to ribosome.ch, which is now a shop,
rather than to 

<http://sustrik.github.io/ribosome/>

which I infer based on authorship and style is the intended target.

Typo in 

<http://250bpm.com/blog:93>

**dept** instead of the probably-intended **debt**.