Logic Riddles

Question: I'm number three.
But I'm not a number.
I'm hot and cold at the same moment but not at the same time.
I'm number three.
But I'm not a number.

Who or what am I?

Question: Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy?

Question: You are surrounded by a 100 foot wide and 100 foot deep moat. You have a 40 foot tall ladder, matches, a gallon of water, and as much rope as you need.

How can you get across the moat?

Question: When is 99 more than 100?

Question: Two people are born at the same moment, but they don't have the same birthdays.

How could this be?