From: Steve Klabnik <steve@...>
Date: 2011-11-05T22:18:32+09:00
Subject: Re: Are there two kinds of 'require' ?

And the reason that the current directory isn't in the $LOAD_PATH
(also known as $:) anymore is due to security:
http://www.faqs.org/faqs/unix-faq/faq/part2/section-13.html

This is why require_relative is preferable to 'require "./foo"' or
'$:.unshift(".")`