What is the riddle which can be asked all day with a different correct answer each time.

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

A landlord calls both of his sons and tells them that their horses will now decide who will transfer the inheritance. He tells them to race along the land till the end and the one whose horse will be slower will win and be the heir to all the property.

Both of them keep wandering for days but to no result. Then they ask a wise man regarding it. The man advises them on the matter after which they jump on the horses and race as fast as they can till the end. Why did they do it?

What did the wise man say?

What word is pronounced the same if you take away four of its five letters?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

If a wheel has 54 spokes, how many spaces are there between the spokes?

What always comes into a house through the keyhole?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?