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.
(April 2012). This page lists the winners of the Boston Marathon, which has been running continuously since 1897 and is the oldest annual marathon in the world. The first race, run in 1897, included only 15 runners, all of whom were men.he 42.195 kilometres (26.219 mi) length of the marathon was not fixed before the 1924 Paris Olympics, and the Boston course varied as well.