What is both possible and impossible at the same time?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

What is the coolest letter in the alphabet?

what one word does the below rebus identifies?

If 1+9+8=1, what is 2+8+9?

What number do you get when you multiply all of the numbers on a telephone's number pad?

I am quite hot but become too cold if you remove the first two letters. What am I?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?