Deals in dark helped bitcoin take off, says chief scientist

By Jemima Kelly LONDON (Reuters) - Without dealings in the "grey areas" of the global economy, bitcoin might not have grown to be worth the $3 billion (1.99 billion pounds) it is today, according to Gavin Andresen, the closest thing the digital currency has to a CEO.  Andresen, a self-confessed "all-around geek", is chief scientist at the Bitcoin Foundation, a non-profit group he helped set up three years ago to support and promote the digital currency. Andresen acknowledged