netbuzz writes: "Whether you prefer to call it “the duct tape of the Internet,” “the Swiss Army chainsaw,” or just its given name, the Perl programming language turns 25 today. Perl 1.0 was released by its creator Larry Wall on Dec. 18, 1987." Link to Original Source
Computers are unreliable, but humans are even more unreliable.
Any system which depends on human reliability is unreliable.