A hamster in Germany is redefining "A Random Walk Down Wall Street" author Burton Malkiel's belief that a blindfolded monkey throwing darts at a stock ticker list in the newspaper could do just as good as a human investment professional. The livestreamed hamster, named Mr. Goxx, has been independently trading a portfolio of various cryptocurrencies since June 12, and so far its performance has been impressive. As of Friday, the portfolio was up nearly 24%, according to the @mrgoxx twitter feed that documents daily performance, along with every trade made by the hamster. Mr. Goxx's performance outpaces bitcoin and the...