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?

Science and Technology

How much energy is produced by collision of matter and antimatter?

Outer Space

Why is the sky dark if there are billions of stars in the Universe?

Outer Space

What is the fastest speed a spacecraft can achieve?

Living Creatures

How fast can a cheetah run? Can runners like Usain Bolt and David Rudisha beat cheetah on a racetrack?

Planet Earth

Why does fruit ripen? What causes the ripening process?

Planet Earth

How does Strangler Fig squeeze its host tree to death?