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
.1
Yes, they do.
Assuming you mean long distance running marathons, the marathon was one of the original modern Olympic events that took place in 1896.
No, marathons is a plural noun. The singular form may be used as a noun adjunct (e.g. marathon runner).