Large mammals pooped there in early Triassic period
                                
                                
                                    (Newser) -
                                    Curious about the world's oldest public bathroom? It's in Argentina and it's impressive, covering nearly 3,000 feet and dating back to a time when giant rhino-like creatures roamed the region,  the BBC  reports. Appropriately, the 240-million-year-old latrine is full of big fossilized feces, some up to...