Marathons is plural for marathon, which refers to a running race that is about 26 miles (42 kilometers) long.
It also refers to something that lasts an extremely long time or requires great effort, such as an event or activity, or a contest in which people compete with each other to find out who can do something the longest amount of time
A marathon is a running event in which participants try to reach the goal of 26.2 miles.
Assuming you mean long distance running marathons, the marathon was one of the original modern Olympic events that took place in 1896.
Canada does have marathons. Canadians too fight for deadly disease
The same as marathons anywhere else: 26.2 miles.
Egypt did not have marathons, this is a product of modern sports.
What percent of the world's population runs marathons?
Everywhere
The cast of Marathons for Mandela - 2013 includes: Eddie Izzard as himself
Berlin and London.
The Whiskey Row Marathon races are held on the first Saturday in May in Prescott, AZ
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Yes, they do.
No, marathons is a plural noun. The singular form may be used as a noun adjunct (e.g. marathon runner).