What do you see in the given picture?

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.

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

John was piloting a plane behind a car but was never able to overtake it. Why?

What English word has three consecutive double letters?

Which wheel of car does not rotate when you turn your car right?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?