It is always ahead of me yet I can never see it. What is it?

Can you solve below mathematical equation?

2^1234 - 2^1233

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

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

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What does this simple rebus mean?

Find the next number in the series.
1 10 24 43 67 ?