It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Can you find the missing piece of the Porsche?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

What English word has three consecutive double letters?