https://css-tricks.com/lets-look-50-interesting-css-properties-values/
https://hakibenita.com/sql-tricks-application-dba
http://www.magazineduwebdesign.com/conseils/guides/design-newsletter-7-hacks-pour-des-emails-qui-convertissent/
http://sahandsaba.com/thirty-python-language-features-and-tricks-you-may-not-know.html
http://www.sohtanaka.com/web-design/css-border-tricks-tutorial/
http://www.smashingmagazine.com/2008/09/11/75-really-useful-javascript-techniques/