You have read
about the Pandavas and Kauravas. They were cousins.
Dronacharya was their common Guru.
One day Dronacharya set them a test in archery. The Master kept a toy bird on a branch of
a tree. He asked his pupils to shoot it down.
He called Duryodhana first.
Duryodhana came forward with his bow and arrows. He stood by the Master.
"What do you see above, other than the bird?" asked Dronacharya.
"I see the blue sky," replied Duryodhana.
Telling him to step aside, the Master asked Karna the same question.
Author - Dharamsey M. Khatau