The first stamp depicts the Indian Flag with what slogan ?

The                 used pigeons to communicate the names of the winners at the Olympic Games to other cities.

What was the nationality of Samuel Morse ?

Marconi shared the 1907 Nobel Prize in Physics with                    

What was used before radio ?

When was telephone invented ?

What is the technichal term for " change into understandable language" ?

The                   used pigeons for sending messages about two thousand years ago.

The first stamp of independent India was issued on                       

Marconi shared the Nobel Prize in Physics with Karl Ferdinand Braun for which year ?