A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Why is a river so rich ?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Can you make four (4) nines (9) equal 100?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Can you find a number that lies one third of the distance between 1/3 and 2/3?