Ruby
Time::is - s useful for freezing time at a certain point and executing a block of code.
Enumerable#sum - Sum the elements of the array.
Structural Duplication - Taking DRY to the next level
Rails
Caching makes your brain explode
The secret to Memcached
Visualize your Rails model associations
Setting up multiple asset hosts in rails
Synching your Amazon S3 asset host using [...]
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