Most cases of black stools are from eating black foods or iron supplements. The most common condition causing black stools is a bleeding ulcer. Black stools caused by blood indicate a problem in the upper digestive tract. Blood in the stool can be detected through a stool test.
Akashi-Kaikyo Bridge, Japan. The Akashi-Kaikyo Bridge, spanning the Akashi Strait, connects the city of Kobe and Awaji Island in Hyogo Prefecture. It is the world's longest suspension bridge, with its central span measuring 1,991m. Its made up of six lanes with a combined length of 3,911m.
1 San Francisco â Oakland Bay Bridge (Eastern Span). The widest bridge in the world (78.74 m) is also the most expensive bridge and the largest self-anchored suspension bridge ever constructed.  Tacoma Narrows Bridges (Washington State) 853 mâ1950 & 2007. The pair of bridges with the longest spans in the world (853 m).