Living Creatures

What is hibernation? And how is it different from aestivation?

World

When did the Earth Day start to be observed? Which incident inspired the creation of Earth Day?

Science and Technology

What is 3D printing?

Planet Earth

What are the principal layers of the atmosphere of Earth?

How things work

Who invented the dishwasher?

World

What is the story behind the formation of WWF?

World

What is Swiss Army Knife? Who Invented It?

World

What is Magna Carta? What is its importance in history?

How things work

Who painted the picture Guernica? Which tragedy inspired it?

How things work

Who is known as the father of typewriter?

World

What was the Boston Tea Party?

How things work

Who was the inventor of the fax machine? Who established the first commercial fax service?

How things work

What is an Ophthalmoscope? Who invented it?

Human Biology

How long can a person go without sleep?

Human Biology

Why is it necessary to sleep every night?