Why Wine Glass Stem is so long?

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

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.

What brings you down but never up?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

what does the below math rebus puzzle mean?

If you say my name, I will no longer exist. What am I?

Solve the counting riddle by identifying the number of triangles in the given picture.

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?