Planet Earth

Why does a river curve and twist instead of running straight?

Human Biology

What causes an intensely painful and persistent toothache? And what is the remedy?

Outer Space

Will the Earth become a black hole one day?

Human Biology

What does a virus look like? How does it function?

World

What is the origin of the frequently used expression OK (Okay)?

Planet Earth

Why is the sky dull when a storm is coming on?

Planet Earth

Why is it easier to swim in saltwater than in fresh?

Human Biology

Why do we have lines on the palms of our hands?

Planet Earth

Which Are The Tallest Plants And Trees In The World?

Living Creatures

Why does mosquito bite itch? How to prevent mosquitoes from biting?

Science and Technology

What is the size of an atom? Can we see it?

Human Biology

How does the pain killer Aspirin work inside the body?

Planet Earth

What is sponge? Is it an animal or a plant?

Living Creatures

How do insects infect us through their sting or bite?

Living Creatures

How can some insects like housefly walk upside down on the ceiling?