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?

Living Creatures

Relative to its body size which bird lays the largest egg?

Planet Earth

How did scientists determine that the Earth bulges at the equator?

Science and Technology

Why do radioactive materials like plutonium in nuclear waste continue to pose a threat for many thousands of years?

How things work

Who invented solar cells to harness the Sun's energy?

How things work

How fast can a helicopter fly?

Outer Space

Which is the most dangerous stage of a manned spaceflight?

Living Creatures

How do hummingbirds manage to hover in mid-air?