Planet Earth

How do dolphins sleep without drowning? Is it true that they sleep with one eye open?

How things work

How do scientists calculate the number of calories in a particular food and the number of calories in a particular exercise?

Planet Earth

Which has been the highest officially recorded sea wave?

Science and Technology

Why do we hear sound father away at night better than during the day?

Planet Earth

How is scent extracted from flowers like roses?

How things work

Who reported seeing UFO for the first time?

How things work

Why does water bead up on the surface of a wax-polished car?

Outer Space

What would happen if Earth passed through a comet's tail?

Outer Space

What is ‘Grandfather Paradox’ concerning time travel and how can it be resolved?

World

Which is the most unusual language in the world?

Outer Space

How do scientists know that dark energy is speeding up the expansion of the universe?

Science and Technology

How fast can a supercomputer work at the very most? Is there a theoretical limit on the speed of its operations?

World

Why did Columbus sail west instead of east if he wanted to reach India?

Living Creatures

If the venomous snake bites itself would it die?

Planet Earth

Why don’t we feel the motion of the rotating Earth?