Video: ESPN’s Sport Science examines Nik Wallenda’s walk across Niagara Falls     Last night 33-year old Nik Wallenda walked from the United States side of Niagara Falls to the Canadian side across a wire suspended 200 feet in the air that was 5 inches in diameter. The seventh-generation acrobat/daredevil started his journey at 10:16 ET and completed it at 10:41. Wallenda's wife ... Read More