1 A highly toxic form (methylmercury) builds up in fish, shellfish and animals that eat fish. 2  Fish and shellfish are the main sources of methylmercury exposure to humans.3  Mercury exposure at high levels can harm the brain, heart, kidneys, lungs, and immune system. A highly toxic form (methylmercury) builds up in fish, shellfish and animals that eat fish. 2  Fish and shellfish are the main sources of methylmercury exposure to humans.
The 2016 Boston Marathon will begin on Monday, April 18. Here is some of the basic information you should know about the historic event. Length: According to Olympic standards, marathons are 26 miles and 385 yards, or roughly 26.2 miles long. Route: The Boston Marathon starts on Main Street in Hopkinton, Mass.
How Many Miles Is Half marathon = 13.1 miles, 21.7 kilometres. A respectable time it takes to finish a half marathon is 2 - 2Â½ hours. How Many Miles Is a Marathon = 26.2 miles, 41.2 kilometres. The Ultimate Running Guide For Beginners... Learn to Run the 'Easy' Way - a Simple, Step By Step 6 Week Running Plan.