A huge portion of a German rapper's skull had to be surgically removed after his homemade drug laboratory exploded. Rapper Dr Knarf, whose real name is Niko Brenner, was thrown from his Cologne recording studio in February 2017 after bottles containing highly flammable propane gas exploded. Knarf was using the gas in a DIY drug laboratory to create a highly concentrated form of cannabis extract. His chances of survival were ...