Good Riddles

Question: Which gate can you not go through?

Question: A man has 3 children and half of them are girls, how is this possible?

Question: You are trapped in a room. There are two doors. If you go in one door, a dragon is going to breath fire on you. If you go into the other door, there is a room made of magnifying glass. And the sun is reflecting off of it and will burn you. How do you escape?

Question: I turn polar bears white
and I will make you cry.
I make guys have to pee
and girls comb their hair.
I make celebrities look stupid
and normal people look like celebrities.
I turn pancakes brown
and make your champagne bubble.
If you squeeze me, I'll pop.
If you look at me, you'll pop.

Can you answer the riddle?

Question: Two men/women in absolutely identical conditions have two of the exact same water bottles (full of water). An hour passes, and the temperatures of the water inside the bottles are measured. The temperature of one of the bottles is noticeably higher than the temperature of the other. Assuming that the temperature of the setting they were in, as they were both the same, had to do with the change in temperature of the water, why are they different?