1) What did Germans do to hide important documents during World War II? 2) How could the people read the German codes? 3) How did ancient people hide secret messages on a man's head? 4) In which way can we hide secret messages nowadays?

લીડરબોર્ડ

દૃશ્યમાન શૈલી

વિકલ્પો

ટેમ્પલેટ બદલો

આપોઆપ સંગ્રહ થયેલ છે: ?