I have feet, but no legs. Which animal Am I?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

The more it dries, the wetter it becomes. Can you tell what it is?

Next Number in the Series,

5, 16, 49, 104, ?

Why do people go to bed?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?