What does an Island and the letter T have in common?

Next Number in the Series,

5, 16, 49, 104, ?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

There are forty elephants and they have forty-fore heads. How can this be possible?

What runs around the whole yard without moving?

I cannot talk, but I always reply when spoken to. What am I?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Can you solve below mathematical equation?

2^1234 - 2^1233

Spot 5 differences in two Christmas tree below:

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?