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Double space?

This isn’t about actual programming, but about the comments in the code.

I noticed many (if not all) comments have 2 spaces after every period.

I’ve never ever seen this before.

What’s the reasoning behind it?

In elementary school we were taught to double space after sentences. It separates the sentences to make them easier to read and eliminates confusion with abbreviations.

It also doesn’t work in forum posts, it removes the double space.

There is a whole wiki page on it http://en.wikipedia.org/wiki/Sentence_spacing

Ah, interesting, is this a US specific thing or something?