An Anti-Abuse Ad With A Secret Message Only Children Can See(techcrunch.com)
techcrunch.com
An Anti-Abuse Ad With A Secret Message Only Children Can See
http://techcrunch.com/2013/05/06/an-anti-abuse-ad-with-a-secret-message-only-children-can-see/
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>> In order to discreetly reach abused children, one aid organization designed a clever billboard that only displays a hotline number for people shorter than 4’5″ <<