What goes up but never comes down?

Can you count the number of lines in the below picture?

What is the next shape from answers A, B, C, and D figure?

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

Using Only Five 5's and any mathematical operator make sum as 37

There are 3 apples in the basket and you take away 2. How many apples do you have now?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91