Think about it...
Your great grandpa who lived centuries ago and who is still known
for the great inventions he made in the past wrote you a letter!
Ali Qushji the space engineer
Al-Biruni the famous mathematician
Evliya Chelebi the traveller
Al-Farabi the second teacher in the world
Hezarfen Ahmed Chelebi the first aircraft engineer and
Ibn Khaldun the most important historian and philosopher of the
 world wrote you a very special letter. It is very exciting isn't it?
When you read these letters you will both travel to the times
your grandpas lived in and learn about their wonderful works.
Come on kids! Now it is time to read the letters
 from our "Wise Grandpas"...