World

Which was the first country to introduce paper currency?

How things work

Is it true that during warm weather it is a bad idea to fill car's petrol tank at the end of the day?

Living Creatures

Which birds have the most and the least feathers?

Outer Space

What type of physiological problems the astronauts undergo after spending a long period in the weightless condition?

Human Biology

How does an artificial heart work? Who was the first recipient?

Planet Earth

Is Mount Mauna Kea of USA taller than the Mount Everest?

Planet Earth

Why pulses and beans contain protein and vegetables don’t?

Planet Earth

From Where Does The Sweet Water Come Inside Coconut?What Is Its Role?

World

Has any of Nostradamus's predictions actually come true?

World

Which is the port and which the starboard side of the ship?

How things work

Why does wood warp in damp weather?

Outer Space

What is the source of the Sun’s energy output?

Outer Space

What did the American astronauts leave behind on the Moon?

World

When were elephants first used in war and how far were they effective?

Science and Technology

Where does a text SMS go if the receiver’s phone is switched-off?