$ sudo gem sources -r http://gems.datamapper.org
Bulk updating Gem source index for: http://gems.rubyforge.org/
ERROR: While executing gem ... (Gem::RemoteSourceException)
HTTP Response 404 fetching http://gems.datamapper.org/yaml
$ sudo nano ~/.gemrc
Startups: How to Do a Pre-Mortem (and Prevent a Post-Mortem) - Doctors conduct postmortems to figure why people died. They do this to solve a crime, prevent the death of others, and satisfy curiosity. However, once s...