The 10:23 Challenge is a follow-up to the 'overdose' protest staged by the 10:23 Campaign in 2010. International protesters from more than 10 countries, and more than 23 cities will gather for over the weekend of February 5-6 2011, to make the simple statement: Homeopathy - There's Nothing In It. El Desafío 10:23 es una protesta internacional mediante sobredosis homeopática para hacer una simple declaración: Homeopatía - No hay nada en ella.