Planet Earth

Why is the center of the Earth still hot?

Human Biology

Why do eyes close when sneezing?

Human Biology

What are the causes and treatments of pimples or acne?

Science and Technology

Why are drops of liquid always spherical in shape?

Living Creatures

Is it true that only female mosquito bites? What does male mosquito feed on?

Living Creatures

Why do dogs run behind cars and bikes?

How things work

Why do air travelers experience jet lag after a long-haul flight? And how to prevent or remedy it?

Outer Space

Is our Milky Way a static object or rotates like planets and stars?

Science and Technology

Who designed Analytical Engine, the first programmable computer?

Science and Technology

Why is diamond so hard even though it is basically graphite?

World

Which is the most valuable object relative to its weight and size?

How things work

What is horsepower? Why is it calculated on the basis of horse's physical strength?

World

What is the origin of the word 'robot'? And what were the first robots?

Planet Earth

Have the oceans always been salty?

Planet Earth

How do cracks appear in mud flats during the period of drought?