World

How did Greenwich become the center of the world time?

World

How many times did Christopher Columbus visit North America?

Planet Earth

Why is there a runaway greenhouse effect on planet Venus?

Planet Earth

What creates ripples like undulating patterns of sand in the desert?

Living Creatures

Why do the snakes living in deserts move sideways?

Planet Earth

Why don’t trees suffocate during autumn for they carry out respiration through leaves?

Planet Earth

How much is the Earth flattened at the Poles?

Planet Earth

Why the salt in the Dead Sea keep increasing even though it continuously keeps adding fresh water from the river?

Outer Space

What kind of a star is called White Dwarf?

Planet Earth

Who was the first to estimate the weight of the Earth?

How things work

How is cold generated in a refrigerator? Why is icebox positioned on top in a fridge?

Outer Space

Why is the Moon sometimes visible during the day?

Science and Technology

Why are the windows in airplane passenger cabins oval?

World

Why Mediterranean Sea is named so?

Outer Space

Could Jupiter ever become a star? If it did, how would it affect the solar system?