Subliminal messages.

http://www.livescience.com/health/070802_micro_expressions.html
Funny, so if everyone smiled, everyone would be nicer! Maybe the japanese tradition of 'wearing masks' when unhappy (if you ever see a japanese person smiling at a funeral, understand that they do it to hide the pain) could make the world a better place. Remember, though, you need to let things out. If you bottle everything up, it'll eat away at you from the inside... and extreme events like the death of a loved one definately needs to be let out. (though, denial is really common).

http://www.mispbo.com/subblaster.htm
Here's some free subliminal software, I wonder if it can do mathematical formulae.


http://www.ciadvertising.org/student_account/spring_01/adv391k/hjy/adv382j/1st/application.html
According to Key, despite the fact the embedded words are not consciously perceived, they are unconsciously perceived and can elicit sexual arousal which in turn makes the products more attractive to consumers <13>.