Decode this picture on T-Shirt and tell what it says ?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Prove that twice of ten is the same as twice of eleven.

Name a key which is hardest to turn.

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

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?

Move four matchsticks to the below square to form three squares?

What happened when the wheel was invented?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Replace the question mark with the correct number in below Picture: