To understand the value of a year: ask a student who didn't pass their final exams. To understand the value of a month: ask a mother who...

Having a tree house seems exotic and difficult to achieve. There are technical restrictions and the cost is high. The budget for a...

It has been 20 years since Concorde was retired on October 24, 2003, after its last journey between New York and London.  From its first commercial flight, on 01/21/1976 and for 27 years, Concorde transported almost four million people and carried out 50 thousand supersonic flights. However, high operating costs, high fares and a serious plane crash, among other factors, led to the closure of the first commercial plane to exceed the speed of sound. The (privileged) supersonic