Teaching grandmother to suck eggs is an English language saying meaning that a person is giving advice to someone else about a subject of which they are already familiar (and probably more so than the first person). == Origins of the phrase == The origins of the phrase are not clear. The OED and others suggest that it comes from a translation in 1707, by J. Stevens, of Francisco de Quevedo (Spanish author): "You would have me teach my Grandame to suck Eggs" == Notable early uses == The History of Tom Jones, a Foundling, Henry Fielding (1749): “I remember my old schoolmaster, who was a prodigious...

Programming Perl, best known as the Camel Book among programmers, is a book about writing programs using the Perl programming language, revised as several editions (1991-2012) to reflect major language changes since Perl version 4. Editions have been co-written by the creator of Perl, Larry Wall, along with Randal L. Schwartz, then Tom Christiansen and then Jon Orwant. Published by O'Reilly Media, the book is considered the canonical reference work for Perl programmers. With over a thousand pages, the various editions contain complete descriptions of each Perl language version and its interpreter...

The Perl Cookbook, ISBN 0-596-00313-7, is a book containing solutions to common short tasks in Perl. Each chapter covers a particular topic area ("Strings", "Ties, Objects, and Classes", "CGI") and is divided into around a dozen recipes each on a particular problem ("Reversing A String By Word Or Character", "Accessing Overridden Methods", "Managing Cookies"). Each recipe has four parts: "Problem", "Solution", "Discussion", and "See Also". The Perl Cookbook is written by Tom Christiansen and Nathan Torkington, and published by O'Reilly. The Perl Cookbook inspired the PLEAC (Programming Language...

The MD5 algorithm is a widely used hash function producing a 128-bit hash value. Although MD5 was initially designed to be used as a cryptographic hash function, it has been found to suffer from extensive vulnerabilities. It can still be used as a checksum to verify data integrity, but only against unintentional corruption. Like most hash functions, MD5 is neither encryption nor encoding. It can be reversed by brute-force attack and suffers from extensive vulnerabilities as detailed in the security section below. MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function MD4...