Living Creatures

Why does a dog go round and round before it lies down?

How things work

Why ice-cream sometimes causes a headache?

Planet Earth

Why the composition of the atmosphere is so specific and steady with 21% oxygen and 78% nitrogen?

Living Creatures

Why do ants touch each other with their heads when they meet? Why do they walk in a file one behind another?

Science and Technology

What shape do raindrops have? Are they tear-shaped like normal droplets of water?

Outer Space

Do other planets experience total solar eclipse like the one we witnessed on July 22, 2009?

Human Biology

Why do we feel dizzy after running in circles?

How things work

Why the entire surface of the passenger planes is not painted over? Why the nose of the plane is black?

Human Biology

Why do we rub our eyes when we are tired?

Planet Earth

Why do clouds float in the sky even though they have tons of water in them?

Human Biology

Is overdose of vitamins harmful or the body just flushes out the excess substance?

World

When was the Great Wall of China constructed? And what is its exact length?

Living Creatures

How does a chameleon change color to blend with its surroundings as a protective measure?

Science and Technology

Does iron increase in weight when it rusts?

Human Biology

Why do eyes burn when cutting onions? How to prevent it?