What is more useful when it is broken?

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

What does this below rebus puzzle mean?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

The more it dries, the wetter it becomes. Can you tell what it is?

Can you solve the photo plexer logic ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?