What work can one never finish?

Remove two matchsticks to make the below equation correct.

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

Count the number of triangles in the given picture.

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

What has a bottom at the top?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

How many words can a pen with half refill write?