As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?

How can one talk without saying a single word?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?