Living Creatures

Why do dogs sometimes breathe with their mouth open and tongue lolling out?

Science and Technology

Do things weigh heavier or lighter when hot or cold?

Planet Earth

Why different flowers have different colors?

Science and Technology

How many patents are granted for perpetual motion machine so far?

Science and Technology

Why some diseases are infectious while others are not?

Outer Space

Why there are more stars in the sky some nights than the others?

Planet Earth

When, how, and where was the world’s first coffee discovered?

How things work

Why does yeast make bread rise and bubble?

World

Which is the most expensive coffee in the world? (Kopi Luwak)

Planet Earth

Should we see the Earth go round if we stood still in a balloon in the sky?

Science and Technology

Why walking on ice is difficult? Why is ice slippery?

How things work

Why does water gurgle when it's flowing out from a bottle?

How things work

Who brought the idea of a leap year in our calendar, and why?

Outer Space

Why is it not possible to see a black hole?

How things work

How is Einstein's theory of relativity responsible for the color of gold?