First, the infinite building. Let’s say there was a hotel, with an infinite number of rooms, and an infinite number of people staying there. A person wants to go in. What would you do?

Next, an infinite bus with an infinite amount of people wants to rent rooms from the hotel. What would you do?

-From TED-ED “The Infinite Hotel-

Secondly, easy riddles.

You measure my life in hours and I serve you by expiring. I’m quick when I’m thin and slow when I’m fat. The wind is my enemy. 

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I? 

What is able to go up a chimney when down but unable to go down a chimney when up?

One of these words does not belong: Which is it and why? Brawl, Carrot, Change, Clover, Proper, Sacred, Stone, Seventy, Swing, Travel.

I’m everywhere and a part of everyone. I am at the end of space and time and existence itself. What am I?