Rearrange the letters in "new door" to make one word.

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

I am quite hot but become too cold if you remove the first two letters. What am I?

A man dies of old age on his 25 birthday. How is this possible?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

What goes up but never comes down?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Identify the 10 differences between the two given pictures.