Why do you find that most of the buildings are deprived of the 13th floor?

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?

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

Can you find the six hidden animals in the picture below?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
S O L E S
=========
T O W E L
=========

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

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Can it be possible to build a house that has all its four walls facing towards the South?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?