Postal service looks to compete with recent changes
                                
                                
                                    (Newser) -
                                    Watch out FedEx, UPS, and Amazon. The US Postal Service is expanding same-day deliveries, shipping things like groceries, water, and fish to customers in seven cities, in order to compete with its competitors and boost revenue under  new postmaster general  Megan Brennan, report the  Wall Street Journal  and  Consumerist . Brennan...