What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Before Mount Everest was discovered, what was the highest mountain in the world?

What's a single-digit number with no value?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

What came first, the chicken or the egg?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

What makes this number unique: 8,549,176,320?