What Adam and Eve do not have but the rest of the people have?

Why do we preferably have round manhole covers and not square ones?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

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

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

What country can make you shiver?