Find the value of "?" in the ball picture Riddle below:

Can you solve the below tricky visual equation?

What number when divided in half becomes zero?

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

which number am I?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

The host of a game show offers the guest a choice of three doors. Behind one is an 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?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

How can you drop a raw egg from a height onto a concrete floor without cracking it?