Why Aeroplane windows are round?

What begins with T, ends with T, and has T in it?

What type of tree can I carry in my hand?

What is the coolest letter in the alphabet?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

A man was telling some of his war stories to his grandchildren.
"When the World War I was on the verge of end, I was awarded for my bravery for I had saved a group of my men." He coughed and then added, "When we were fighting in northern France, an enemy soldier threw a grenade at us. Before it could explode, I picked it up and threw it away. For my act of bravery, right before the war ended, A General gave me a sword engraved with the words "Awarded for Display of Bravery and Heroism in World War 1"."

Hearing this, one of the grandson spoke up. "Grandpa, this is not a true story. It can"t be true!"

The truth is that it was not. How did the grand children know it?